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Geology of the Australian Capital Territory

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1131:. It is generally leached, and frequently silicified. The colour of the beds alternates between grey and black, but where weathered, it changes to whitish grey. The graptolites appear on the bedding planes as black films. In Canberra, the Acton Shale appears in several outcrops in Acton, in two bands through Aranda, through Bruce near the Calvary Hospital, on the Bruce Ridge behind Lyneham. Also another band starts under the University of Canberra in Belconnen, and heads north east through Lawson and Giralang and folded and faulted into several bands in Crace on Gungahlin Hill. Another band is found on the west side of Queanbeyan, extending north to Dundee, and south around the east side of Jerrabomberra Hill. Acton shale is only preserved in the cores of synclines, being eroded from uplifted parts. 3862: 785:. The host rock is a skarn where Shannons Flat Adamellite baked limestone from the Paddy's River Volcanics. The bulk of the mineral here is magnetite, but other sulfide and minerals of copper, lead zinc and silver attracted miners. Thomas Coyle operated the mine in 1895, producing 2.6 tons of copper and 26.1 kg of silver. In 1907 the Cowley Copper Syndicate Ltd started more work cutting two more adits and winzes. It was abandoned by 1909 as the ore was too low grade. More than a million tons of magnetite remain. Many minerals such as 2004: 2012: 157:... Came on to one of the plains we saw at 11 o’clock. At half past 1, came to a very extensive plain, fine Rich Soil and plenty of grass. Came to a Beautiful River plains that was running thro’ the plains in a S.W. direction, by the side of which we slept that night. When we made the Hut this evening, we saw several pieces of stone that had been burnt by all appearances. I then examined some of it, which proved to be limestone. ... 110: 30: 3731: 2565: 3719: 2160: 591: 2373: 2549:. The inclusions are metamorphosed sediments and are common in biotite. It contains quartz and microcline feldspar and brown biotite and also muscovite. It has more biotite and plagioclase than Shannons Flat Granodiorite. The muscovite is distinctly foliated and there is also blue quartz. Texture is fine to medium grained. Close to the Murrumbidgee Fault the texture is 1111:, so the source of the sediments is from another continent. The other evidence from the Ordovician sediments are chemical composition indicates granitic source, with the absence of feldspar. Secondly the fine grained nature shows the sediments have been transported a long way from their ultimate, source, and could have been second cycle, derived from sedimentary rocks. 1996: 2748: 2065:-units show reddish brown alteration. The unit is of Early Ludlovian age. The rock on Mount Rob Roy and Pemberton Hill used to be known as Tuggeranong Granite, but is actually ignimbrite. The ignimbrite forms escarpments, with the lower-lying land being underlain by tuff. The Deakin Volcanics can be found south of the Deakin Fault between Belconnen and 2831:
of 6.7 to 7.0 km/s between 22 and 47 km. Above this layer is rock with speeds of 6.4 to 6.6 km/s from 22 to 15 km deep probably made from basic igneous rocks that were once oceanic crust. Above 15 km depth the P-wave speed is from 6 to 6.2 km/s and likely to be Ordovician turbidites as seen at the surface.
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buff-coloured laminated siltstone and shale with fine sandstone beds contorted by slumping. Its top is an unconformity, with Camp Hill Sandstone lying on top. There is probably up to 200 metres thickness of this shale. The shale was deposited in the deep sea as turbidites. It can be found in Yarralumla,
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depth is about 46–47 km below sea level. South south east of Canberra to the Tasman Sea is a region of lower Moho depth than the surrounding south-east Australia. Seismic P-waves travel at 8.1 km/s in the mantle below this boundary. Above the Moho is an underplated layer with P-wave speeds
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there is migmatite where the sediments have been partially melted in order to produce the plutonic rocks in the batholith. Variations in their composition are explained by partial mixing with melted oceanic crust. The batholith was largely crystallised before emplacement, and made space for intrusion
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The subducting Pacific plate was old, cold and dense, easily sinking into the mantle at a steep angle. The hinge zone of the plate also migrated oceanwards over time. So the trench retreated oceanwards, and the old trench and ocean floor become part of the continental plate. Volcanoes formed inwards
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capped with black shale. It consists mainly of fine to medium grained quartz rich sandstone and some mostly thin beds of siltstone, shale and slate. The sediments occur in a band on the west side of the ACT on Bulls Head, Mount Franklin, Mount Ginini and along the upper parts of the Cotter River. A
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A coarse green grey rhyodacitic intrusive with white prominent feldspar crystals appears between the arms of Lake Ginninderra, McKellar, Evatt, Nine Elms, east Spence, and Nichols. This covers a few square kilometres. A small outcrop of the same material occurs in Cook and Jamison Center. This rock
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sediment. The eruption came from a volcano into shallow sea water. The deposits built above sea level as they progressed. The underlying sediments now make up the Canberra Formation. Between Hall and Nanima Hill on Spring Range, the Mount Painter Volcanics lie unconformably on top. These rocks date
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Several stages of volcanic activity followed. The first stage with Paddys River Volcanics, Walker Volcanics in west Canberra, Hawkins Volcanics in the north and Ainslie Volcanics in the north east had acidic lava volcanoes erupting. The next stage was Mount Painter Volcanics in middle Canberra, and
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Tidbinbilla Quartzite has been modified by granite intrusions close by. It consists of medium grained sandstone, partly silicified and changed to quartzite. Belts of silstone and sandstone are included becoming more frequent at the top. The exposure is 300 metres thick. Low down there is a 2-metre
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by Öpik in 1958. It consists mainly of mudstone which may be cemented by lime, or originally derived from tuff. There are some beds inserted of quartz sandstone or limestone. The bottom of the formation is on top of the Mount Painter Volcanics. The top of the formation grades up into pyroclastics
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north to the east of Woolshed Creek, through Majura and at least to Gooroo Hill and Old Joe on the NSW border. On Mount Ainslie the sequence starts with dacitic tuff, banded dacitic tuff, massive dacitic tuff, fifty metres of agglomeratic tuff, massive dacitic tuff, fifty metres of ashstone and
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lens north of Uriarra Crossing. The outcrop goes from Mountain Creek Road in the west to the Murrumbidgee river in the east. It extends a few kilometres to the north of the ACT border and south to the Winslade Fault near the Cotter River. A wedge extends to the south south west, which includes
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Deposition occurred in a shallow marine environment with a delta. The sea level was relative higher during this depositional phase compared with the earlier and later subaerial volcanic deposit periods. Its age is early Ludlow. This has been determined by shelly marine fossils, and a tonalite
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are found. The geological formation east of Queanbeyan used to be known as the Muriarra Formation. This alternates between sandstone with a high quartz content and mica, and phyllite. Radiolarian chert is found in the central section. The railway forms the border between Queanbeyan in NSW and
428:. The flow was in the northerly direction, indicating that the continental slope was to the south. These deposits occurred during the Ordovician period. The ocean floor was distant from the continental source of the sediment. Towards the end of this period there were isolated parts where no 1175:
is shale, mudstone, siltstone and minor sandstone. In the type location there is about 60 metres of non-calcareous sandy shale and dark grey shale with beds of fine-grained sandstone. Between Kings Avenue and Commonwealth Avenue, there is a good outcrop on State Circle, consisting of
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in the ACT. West of the Queanbeyan railway station is a cutting where folding has overturned the beds, with axes dipping to the east at 50 degrees. 300 metres of thickness is exposed in this cutting. Llanvirnian age (Pygodus serrus conodont zone). Fossils found include Phyllograptus anna,
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Horst. This was probably in a different position relative to Canberra, compared to the present. From here, ocean floor turbidite deposits occurred in the Ordovician period. The sediments were deeply buried by being compressed and faulted down. Melting occurred in deep sediments and in the
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Magnetic deviation through the centre of Canberra was measured at 12.00 degrees east in 1985. The contours run North east. Each year it shifts 2.2 minutes to the east. Magnetic field in all three components is measured continuously at a station in Canberra and made available online.
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is a fine grained tuff. In addition to the ashstone the Canberra Formation has layers of green-grey to reddish dacite, also tuff, quartz andesite, but mostly it is calcareous shale, limestone or sandstone. Much is deeply weathered, which has posed difficulties for building foundations.
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The Paddys River Volcanics consist of dacite and tuff with some shale phyllite and limestone. They occur to the west of the Bullen range, along the lower parts of the Paddys River. They were deposited on top of the Ordovician Adaminaby Beds, and intruded by Shannons Flat Adamellite.
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Walker Volcanics appear as purple or greenish-grey dacitic ignimbrite. These volcanics contain chloritised cordierite and some have garnet. They are Wenlock age. They occur in southern Belconnen including Macquarie, Weetangera, Hawker, Page, Scullin, Higgins, Holt and the Pinnacle.
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In the east side of the Cullarin Block, in the east-pointing finger of the ACT, the Tabberabberan Orogeny also reached the upper greenschist facies again. East–west pressure caused ruptures forming the Winslade and Deakin Faults and other northwest- or northeast-trending faults.
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core of the continent. The Tasmanides are the result of compression, horizontal shortening, and vertical thickening of various "terranes" such as small continental fragments and volcanic island arcs that were plastered against the original continental margin as a result of
1239:. The deposition was in a marine proximal turbidite fan, with the turbidity current flowing to the east. There are no fossils, but there is some sedimentary structure including plane, cross or convolute laminations, load casts, slump units and flute moulds. 3479: 448:
from the trench. The part of the oceanic plate attached to the continent was compressed, the suboceanic crust was severely shortened and thickened as well, giving rise to a duplex structure. This happened at the end of the Ordovician period and in the
1610:, who called it a porphyry. The description is a massive dark bluish-grey dacitic crystal tuff containing garnet and chloritised cordierite. There is a local appearance of agglomerate and pumice. There are prominent quartz and feldspar phenocrysts. 777:
was tunneled in the Balconnel Gold Mine around 1894. No significant gold was ever found there. The mine was 200 m downstream from the Molonglo River on the Murrumbidgee River with coordinates 35°S deg 14' 38.3", 148°E deg 58' 13.6".
2049:. Southwards the section passes up into a massive and partly banded rhyodacitic ignimbrite. The bottom of the Deakin Volcanics is exposed on nearby Heysen Street. At least 400m thickness of beds are exposed in the Parkway cutting. The 2767:
Pool Area. A similar dyke also outcrops on the west side of the Murrumbidgee River near Pine Island. The dyke is less than 0.5 metres thick. The rock is black, showing up well against the reds and browns of the Laidlaw Volcanics.
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At the time these sediments were deposited the location was at least 3,000 km from the Australian continent. Underneath there is no Proterozoic continental basement, instead these sediments are lying on top of oceanic crust.
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is −400, the highest levels in the metropolitan area are at Watson and Mitchell at −350, and at Mulligans Flat at −345. This means that a 50 kg person, if measured on a force scale rather than on a balance, would apparently
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Trigonograptus ensiformus, Pterograptus, Didymograptus, Isograptus, Hallograptus from the Darriwillian age. Near the top of the formation are fossils Dicellograptus sextans, D divaricatus, D salopiensis, which are Gisbornian.
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A second unconformity occurred after the Black Mountain Sandstone was uplifted and eroded at the end of the early Silurian. This was called the Quidongan Deformation. The Canberra formation was deposited in shallow water with
106:. At the time these were the oldest fossils discovered in Australia, though this record has since been far surpassed. Other specific geological places of interest include the State Circle cutting and the Deakin anticline. 1150:
period. Lower beds contains fossils like Dicranograptus nicholsoni. Upper beds contain Climacograptus bicornbis, Chastatus, C tubuliferis, Dicellograptus elegans, and Dicranograptus hians which are late Eastonian in age.
2881:, so this level is –32 milligals. Another high of –330 μm·s is just north of the northernmost point of the ACT. The contours in the ACT run NW–SE. At the Canberra GPO is about −440, at Scriviner Dam −510, at 1303:. It is also found through North Canberra, excluding Campbell and Russell. It occurs through most of Gungahlin apart from Crace and Nicholls. The beds extend north in a wide band to 35 deg 03S near Bald Hill. 687:
schist occur there. Within this region, there are two parallel belts of knotted schist even more strongly heated to over 525 °C. The temperature gradient in the area was high at 70 °C per kilometre.
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bed called the Tarpaulin Creek Ashstone Member outcrops in an approximate north–south line and acts as a marker within the volcanics. Tuff and flows above and below the ashstone member contain obvious pink
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Hawkins Volcanics is a green-grey dacite or dacitic tuff. These volcanics contain chloritised cordierite, and some have garnet. Their age is Ludlow to Wenlock. The volcanics occur in northern Belconnen, in
452:. The sediments were heavily folded and overthrusted resulting in severe crustal shortening. In the Canberra area the sediments were raised above sea level and eroded. The land to the west (around 440:
debris were deposited into oxygen-depleted deep water. This ocean basin has been called the Monaro Basin. To the north west was a volcanic chain of islands, the Macquarie arc, with an associated
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Plate tectonic processes in the southwest Pacific: a spatial and temporal context Barry Drummond, B. L. N. Kennett, R. J. Korsch, B. R. Goleby & P. A. Symonds Penrose Conference March 1999
149:. Detailed instructions had been given to the explorers by Charles Throsby, who had accompanied the Lake George exploration party earlier in the year. They were provided with acid to test for 1620:
Mount Painter Volcanics overlie the Walker Volcanics unconformably. The top is also an unconformity with Yarralumla Formation and Deakin Volcanics and Yass Formation. The age is of Late
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These fossils were from the Canberra Formation. In the past these rocks were known as the Canberra Group with components of Turner Shale, Riverside Formation, and City Hill Shale.
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The Tharwa Adamellite resembles Shannons Flat Adamellite, but with more strongly zoned plagioclase (An50-20) contains microcline, it is poor in xenoliths and is coarse grained.
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A line of outcrops of coarse pink-brown rhyodacitic porphyry outcrops on the north side of Canberra on Forster Hill, MCquoids Hill and Neighbour Hill, and on East side of
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The Murrumbidgee Batholith formed by melting different sediments to the Ordovician Pittman Formations, as the granites contain more feldspar elements Ca, Na and K. At
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intrusions could also be volcanic necks. If so they have been responsible for the Laidlaw Volcanics. They are all unnamed. The first three intrude Laidlaw Volcanics.
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The Bowning Deformation caused the north–south faulting and long folding in the area surrounding the ACT. This deformation was connected with the attachment of the
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with age ranges of 0.46 and 0.60 Gya, 1.0 and 1.2 Gya, and at ~1.8 Gya, ~2.2 Gya and ~2.7 Gya. These do not match the age of zircons from the interior of the
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and water deposited tuff occur to the west of Pine Island and Point Hut Crossing. North west of Mount Stromlo, on Uriarra Road, there is an occurrence of
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Henderson, G. A. M. and Matveev, G., Geology of Canberra, Queanbeyan and Environs 1:50000 1980. This was used to determine the rock types in each suburb.
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McQueen, Ken G.; J. R. Caldwell; P. W. Millsteed (July 1988). "Primary and Secondary Minerals at the Paddy's River Mine, Australian Capital Territory".
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A coarse rhyodacitic intrusive outcrops to the north west of Charnwood intrudes Laidlaw Volcanics, with about half a square kilometre of surface area.
1696:. Exposures can be seen at the Deakin Anticline—with pale brown siltstone; and also at the Yarralumla brickworks with olive-green calcareous mudstone. 1669:
in the north. The formation is evidence of the last major period when eastern Australia was still covered by shallow seas. It shows fossil evidence of
1550:. The lithology is bluish grey dacitic tuff, which can be massive or foliated, also dacitic agglomerate and shale. These volcanics contain chloritised 3886: 3846: 2050: 1307: 1057: 3861: 3801: 2296:
A coarse porphyritic micro-adamellite was intruded sometime from late Silurian to early Devonian. It intrudes the Hawkins Volcanics in Belconnen in
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are rarely found. The beds are up to 60 metres thick and appear high in the Pittman Formation. The age range is Gisbornian to Bolindian of the
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The sediments making the Acton Shale were deposited in the ocean in a reducing environment starved of oxygen, and lacking fresh sediment.
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East and north east of Watson is an intrusion of grey and cream dacite. This may correspond to the lower layer of the Ainslie Volcanics.
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The Laidlaw Volcanics: a Late Silurian point on the geological time scale by D. Wyborn and M. Owen, W. Compston and I. McDougall in
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which excavates Camp Hill Sandstone, and a large quarry on Mount Mugga Mugga which excavates Mugga Mugga Porphyry for construction
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In an intervening phase in volcanism predominantly sediments were deposited. Yarralumla Formation was named after the suburb of
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mingled and intruded upwards. The Murrumbidgee Batholith was formed, with several intrusions. The faults were reversed and the
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and north are very thick and heavily overturned and thrusted. At Etheridge Creek, the type locality is a repeating pattern of
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sediments and there are some beds of tuffaceous siltstone and sandstone. It was mostly deposited from the air without water.
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Shannons Flat Granodiorite is poor in xenoliths and is coarse grained. It was intruded after the clear Range Granodiorite.
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intrusion southwest of Red Hill with age determined as 417±8 Mya. Outcrops occur on Red Hill (the hill) and throughout
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Dated early Ludlow to Wenlock. This may outcrop in Belconnen and Florey. The composition is calcareous and tuffaceous
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Black Mountain Sandstone is deposited on top of State Circle Shale conformably. It is made up from thick beds of grey
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Henderson, G. A. M., Geology of Canberra, Queanbeyan and Environs Notes to Accompany the 1980 1:50000 Geological map.
3394: 1281:. At the time these were the oldest fossils discovered in Australia, though this record has now been far surpassed. 3608: 3598: 995:
The Pittman Formation was described originally by Öpik in 1958 who named it after the Pittman Valley, southeast of
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The State Circle Shale was named by Öpik in 1958. It is named after the street where it was described. Its age is
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explains the large-scale structure of the Earth's crust and its constituent rocks in terms of blocks moving along
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over the ACT has been measured and published on the 1:100000 Canberra Geological Map. High level points in the
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stage, with shallow burial and temperature below 350 °C. This changed the volcanics and sediments with
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A plate with a continent fragment on board bumped into the east coast of what is now Australia, forming the
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Another pink and green rhyolite porphyry occurs in Holder, Weston and Lyons. It intrudes Deakin Volcanics.
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consisting largely of quartz-rich sandstone, siltstone and shale; the Adaminaby Beds and the Acton Shale.
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The ACT is moving 24 degrees east of north with a velocity of 54.5 mm/yr along with the rest of the
551:. At least four large eruptions made up this volcanic deposit. Over the top of this in the west near the 539:
deposits. Volcanic activity resumed with Deakin Volcanics in the north west and south of Canberra. First
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occurs in the Red Rocks Gorge near Allens Creek. It is oriented northwest–southeast and heads towards
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The Mugga Mugga Porphyry is a lava flow. It is blue or mauve grey in a mass. The rock is veined with
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Small granite intrusions injected the rocks in the Canberra Graben around 408 million years ago. The
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The early European name for the district was "Limestone Plains". In 1820, following the discovery of
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that make up the core of the old mountain range that makes up the Australian continent east of the
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between Hindmarsh Drive and Cotter Road. The visible base shows a weathered repeating sequence of
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Richardson, S. J. and Barron L., 1977 Michelago 1:100000 Geological, Sheet 8726, Geol Surv Sydney
2944:. They have a duplex structure with red or brown clayey layer. Typical thicknesses are 2 metres. 2780: 2435: 2282: 2225: 2183: 1586:
period. They were formed about the same time as the Walker Volcanics and Paddys River Volcanics.
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area. The Canberra area was on the proto-Canberra-Yass Shelf. East of Canberra deep water of the
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operations have occurred historically throughout the region, both for precious metals including
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area has the thickest deposits. Rock types in the Deakin Volcanics are rhyodacitic ignimbrite,
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Basement of the Lachlan Fold Belt: the Evidence From S-Type Granites B. W. Chappell, GEMOC ANU
1658: 1108: 429: 425: 421: 259: 126: 1628:. These rocks form a belt from Coppins Crossing towards Narrabundah and Jerrabomberra Creek. 3968: 3952: 3723: 2929: 2882: 2776: 2414: 2321: 750:, and for construction materials. The only commercial operations now here are the Stockmans 449: 441: 2348:. Minor minerals are apatite and zircon. The surrounding Pittman formation rocks have been 2011: 613:
occurred. In the Canberra Graben and Cullarin Block, metamorphism mostly reached the upper
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The gravity lows are due to the Murrumbidgee Batholith which is compose of lighter rocks.
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where it is found. Originally it was believed to be Ordovician, but is actually from the
3927: 3922: 3735: 2756: 2564: 2386: 1689: 1566: 1223:. The grain size is fine to medium. It was originally named by Öpik after the mountain— 696: 638: 17: 3509: 3981: 3942: 2902: 2349: 2324:. The outcrop covers 4 square kilometres in the ACT. It was intruded during the late 2251: 2239: 2097:. The different colours found in the rocks are due to weathering, the red being from 1621: 1607: 1000: 814: 571: 496: 33:
Australia grew around three fused pieces of very ancient continental crust (cratons).
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topped with massive dacitic tuff. The rocks on top of the eastern ridge is altered.
1095:, are very similar in all parts of the Tasman Orogen, including New Zealand and the 999:. It is entirely of Ordovician age and about 800 metres thick near Canberra, but at 718:
areas. This uplift reactivated the Murrumbidgee Fault, the Queanbeyan Fault and the
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in the north, as these continental units were attached to Australia at the time, in
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There is little limestone evident at the surface in the district, but an outcrop at
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Narrabundah Ashstone is a member of the Canberra formation and is found is eastern
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facies was achieved. This was not sufficient to convert plagioclase to albite.
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Temperature gradients in the Canberra area vary from 20 to 30 °C/km. At
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thick bed of ashstone across a broad area that can be used as a marker bed.
1216: 1212: 1172: 1088: 1084: 1073: 1012: 1004: 798: 703: 676:, east of the ACT on the Molonglo Range and Yarrow Peak and Taliesin Hills. 650: 504: 487:. The source of the Black Mountain sand was near by from the west, from the 484: 480: 402: 196: 185: 150: 95: 80: 76: 50: 1569:. The thickness is at least 700 metres. The magma was formed by melting an 547:, more rhyodacite, tuff with some underwater sediments, and finishing with 3055:"Deakin Anticlines, Macgregor St, Deakin, ACT, Australia (Place ID 13312)" 3025:"State Circle Cutting, State Ccl, Parkes, ACT, Australia (Place ID 13321)" 1995: 1091:, feldspathic sandstone, micaceous siltstone, micaceous shale, chert, and 781:
Paddys River Mine or Cowley copper mine is located 700 m upstream on
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there was a further massive volcanic eruption, called Laidlaw Volcanics.
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separate outcrop extends into the ACT from the south in the area of the
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where their type location occurs, the Ainslie Volcanics are composed of
184:(ACT) are made from granite-like rocks. These are from the Murrumbidgee 129:
decided to send a party, with provisions for one month, to discover the
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Richardson, S. J., 1976, Geology of the Michelago 1:100000, Sheet 8726
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http://www.tams.act.gov.au/__data/assets/pdf_file/0016/13363/78.pdfACT
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A distorted band of coarse grey rhyodacitic porphyry occurs along the
2202:
age 420.7±2.2 m.y. and have been used to set an absolute date for the
1287:
Canberra Formation can be found in the east part of South Canberra in
558:
West of the Murrumbidgee is another different geological setting. The
460:
resulted between the Pittman Formation and the State Circle Shale and
2941: 2886: 2764: 2438:
to the north of the Cotter Dam is actually a dacite flow. There is a
2407: 2361: 2333: 2328:
and is dated at 410+4Mya. The colour is pale grey with mineral white
2195: 2148: 2125: 1725: 1614: 1562: 1558: 1540: 1262: 1209: 1143: 1100: 1065: 1052: 770: 759: 751: 747: 739: 731: 684: 680: 658: 630: 568: 508: 437: 224: 208: 87: 49:. During the Ordovician period the region—along with most of eastern 3539:
Strusz, D. L., 1:250000 Geological Series-Explanatory Notes Canberra
3316:
A. A. Öpik, "The Geology of the Canberra City District", chapter in
3456:
A Geological Guide to the Canberra Region and Namadgi National Park
3458:. Geological Society of Australia (ACT Division). pp. 91–92. 2898:
1.3 grams more in Watson, than they would in western Kambah.
2853:
I = -65.856° dD = -0.008 deg/yr dF = -28 nT/yr dI = 0.014 deg/yr
2746: 2563: 2457: 2371: 2320:
intruding the Pittman formation in the hills to the north east of
2210: 2158: 2046: 2010: 2002: 1994: 1705: 1674: 1220: 1124: 1028: 1016: 661:
in the Laidlaw and Walker Volcanics the temperature was lower and
589: 575: 473: 360: 308: 248: 108: 60:
Most of the younger rocks are pyroclastic deposits from explosive
28: 381:. The remains of the mountains of this orogeny can be found near 2728: 2418: 2410: 2175: 2174:
in the form of pale to dark grey rhyodacitic to dacitic crystal
2058: 2054: 743: 735: 544: 433: 420:
were deposited in the ocean floor in the form of fans formed by
397:. This happened between 520 and 480 million years ago up to the 98:
from the Silurian period were discovered at Woolshed Creek near
3750: 3555: 3512:
Is the Australian Plate deforming? A space geodetic perspective
3417:"Australian Stratigraphic Units Database, Geoscience Australia" 3181:
Crustal Evolution in Southeastern Australia: A Zircon Viewpoint
412:
era at least a few thousand kilometres of the ocean floor were
45:
around 480 million years ago, whilst most rocks are from the
2701:. The total outcrop is 52 square kilometres. It is coarsely 2182:
in the ACT. The Laidlaw Volcanics occur in a band along the
2061:, tuffaceous shale and minor quartz sandstones and volcanic 262:, which is located on a terrane that is called the Benambra 188:
intruding during the late Silurian or early Devonian times.
2905:. This can measure changes in the gravity field over time. 2529:
Clear Range Granodiorite covers 475 square kilometres from
2163:
Ignimbrite from the Red Rocks Gorge has a strong red colour
1235:
epoch. Some of the slopes of Black mountain are covered in
1123:
Acton Shale is a grey to black thinly laminated siliceous
602:
was carried into position on the east coast of Australia.
2250:
in the Walker Volcanic sediments. It is likely to be the
1031:. In the sandstone beds there are occurrences of graded 649:
and opaque minerals. On the western margin in southwest
401:
period. No associated ocean floor has been preserved by
319:
Canberra Graben (north east ACT including Canberra, and
2960: 2901:
A sensitive gravity measuring station is positioned on
2843:
Magnetic Field Components at Civic at the end of 2013:
2713:
occurs in unweathered rock. This leucogranite intrudes
2434:, and the flows have banded flow structure. The Cotter 2920:
heat flow is 73 mWm with a gradient of 27 °C/km.
2873:
just north of the east finger of the ACT of –320 
2186:
to the south west of Canberra, and also north west of
672:
More intense metamorphism occurred to the east of the
2246:
intrusive outcrops over one square kilometre west of
1310:
and in a geological monument along Fairbairn avenue.
153:. On 7 December 1820, Smith recorded in his journal: 3542:
Packham, G. H., 1969, The Geology of New South Wales
3480:"Australian Geomagnetic Reference Field Computation" 2285:
from 1 to 4 kilometres south of Point Hut Crossing.
2140:. It is dated at 414±9 Mya. The Federal Golf Course 2023:
Volcanics can be seen in the road cutting along the
2007:
Deakin Volcanics rhyodacite modified to green colour
1003:
it is over 1,200 metres thick. The lower levels are
291:
Captains Flat Graben (easternmost 3 km of ACT)
53:—was part of the ocean floor. The area contains the 3910: 3869: 3784: 3662: 3632: 3589: 2932:. It is sinking at a rate of 3.5 mm per year. 349:also known as Canberra-Yass Synclinorial Zone west 326:also known as Canberra-Yass Synclinorial Zone East 3536:Canberra 1:250000 Geological Sheet, SI 55–16, 1964 3252:"Definition card for: Narrabundah Ashstone Member" 2537:on the west side of the Murrumbidgee batholith on 2258:matches the upper layer of the Hawkins Volcanics. 1606:This was named after Mount Painter in Canberra by 416:, taking of the order of a hundred million years. 165:, near the Museum of Australia, by the shores of 3516:Geological Society of Australia Special Bulletin 2254:for the uppermost eruption of Walker Volcanics. 1372:Ainslie Volcanics oxide & element chemistry 1064:Chemical analysis reveals low concentrations of 1035:, clay pellets, and current bedding. Fossils of 3387:"Yarralumla Brickpits, Yarralumla, ACT Profile" 3087:. Australian Bureau of Statistics. January 1931 1565:is found on low hills on the north side of the 710:. The Kosiusko uplift elevated the land in the 3335:"Definition card for: Mount Painter Volcanics" 2739:than other Murrumbidgee Batholith intrusions. 2389:. Yet another outcrop is on the Bullen Range. 1589:The Ainslie Volcanics occur on Mount Ainslie, 1277:period were discovered at Woolshed Creek near 706:intruded into the Red Rocks Gorge area of the 215:, which was once a part of the supercontinent 180:Much of the western and southern parts of the 3762: 3567: 2885:Dam −600, and Banks −590. The western end of 177:forming much of the east coast of Australia. 8: 2813:The dyke is believed to be Tertiary in age. 3988:Geology of the Australian Capital Territory 2380:The Adaminaby Beds were formed from quartz 2101:, and the green from clay minerals such as 1593:, and in a band extending from Bonshaw and 1537:Mount Ainslie, Australian Capital Territory 39:geology of the Australian Capital Territory 3769: 3755: 3747: 3574: 3560: 3552: 2889:has the lowest level in Canberra at −610. 1546:and minor volcaniclastic and argillaceous 3437:Volume 59, Issue 1, June 1982, pp. 90–100 3230:"Definition card for: Canberra Formation" 2849:D = 12.273° field strength F = 58096 nT 2771:The rock consists of microphenocrysts of 2751:Black teschenite from the Red Rocks Gorge 2461:by displacement rather than dissolution. 2316:, the Sutton Granite is a medium grained 2105:. The pink crystals are potash feldspar. 314:Collingwood, Queanbeyan, Sullivans Faults 283:Rocky Pic Horst outside the east of ACT. 3296:"Stratigraphic Search Hawkins Volcanics" 2631: 2579: 2472: 1741: 1368: 841: 3274:"Stratigraphic Search Walker Volcanics" 3224: 3222: 2952: 2743:Olivine Teschenite from Red Rocks Gorge 2376:Adaminaby Beds outcrop south of the ACT 1694:Symonston, Australian Capital Territory 3449: 3447: 3445: 3443: 3108: 3097: 2984: 2973: 1215:mostly, but has some beds included of 332:Murrumbidgee, Winslade, Pig Hill Fault 3183:Ian S. Williams and Bruce W. Chappell 2198:, and Greenway. The volcanics are of 1999:Banded Tuff from the Deakin Volcanics 1649:and in southern Yarralumla, and also 483:deposited in a marine environment as 231:. These rocks are an addition to the 79:formation that was formed around 425 7: 3356:Geoscience Australia database record 2568:Shannons Flat Granodiorite from the 1651:Hughes, Australian Capital Territory 1647:Deakin, Australian Capital Territory 1357:. Maximum thickness is 1770 m. 997:Aranda, Australian Capital Territory 609:to the continent. During this stage 582:from the batholith became elevated. 3435:Earth and Planetary Science Letters 2206:. They are up to 850 metres thick. 1686:Lyons, Australian Capital Territory 270:, but the Molong-Monaro Terrane in 2553:and the rock is easily weathered. 2406:The Uriarra Volcanics consists of 363:Trough outside the west of the ACT 243:The Tasmanides also extended into 25: 3699:Heard Island and McDonald Islands 2089:apart from Curtin, and across to 825:have been found at the location. 3860: 3729: 3717: 3500:1:100000 Canberra Geological Map 2798:groundmass. Kaersutite contains 2705:and pale in comparison to other 2447:Late Silurian to Middle Devonian 2136:in lesser amounts and flakes of 2190:. They exist in the suburbs of 2057:(Mugga Mugga Porphyry Member), 1692:. There may also be a patch in 258:The ACT is part of the Eastern 211:. The ACT is positioned on the 41:includes rocks dating from the 3679:Australian Antarctic Territory 2697:is found at Mount Tennant and 2669: 2661: 2653: 2645: 2617: 2609: 2601: 2593: 2518: 2510: 2502: 2494: 2486: 2217:over a few square kilometres. 1984: 1973: 1962: 1951: 1940: 1929: 1911: 1897: 1886: 1871: 1857: 1839: 1828: 1817: 1802: 1787: 1769: 1524: 1510: 1495: 1484: 1469: 1458: 1443: 1425: 1414: 1396: 1103:from the turbidites have been 979: 971: 963: 948: 936: 924: 916: 908: 900: 892: 877: 866: 1: 2304:, the Town Center and Bruce. 1688:north north west towards the 1653:. The formation extends from 3778:Australian Capital Territory 3644:Australian Capital Territory 3318:Canberra, a nation's Capital 3232:. Geoscience Australia. 1990 3208:Australian Heritage Database 3060:Australian Heritage Database 3030:Australian Heritage Database 2627: 2575: 2468: 2178:. They are the top layer of 2167:The Laidlaw volcanics are a 1737: 1684:Another band stretches from 1364: 837: 519:Colinton Volcanics south of 464:Sandstone deposited on top. 223:, the deformed rocks of the 182:Australian Capital Territory 3674:Ashmore and Cartier Islands 2869:field occur at the head of 2802:and has a formula near NaCa 2794:, embedded in a colourless 2583:Shannons Flat Granodiorite 2231:occur throughout the area. 2073:. It also is found through 1745:Deakin Volcanics chemistry 1641:from the Deakin Volcanics. 145:, a nephew of the explorer 4009: 3004:Woolshed Creek Fossil Site 2940:Most soils in the ACT are 2877:. 1 μm·s is 0.1  2557:Shannons Flat Granodiorite 2144:introduces some veins and 247:in the south and northern 113:Limestone outcrop at Acton 3966: 3858: 3712: 3454:Finlayson, D. M. (2008). 3391:www.aussieheritage.com.au 3137:"The Balconnel Gold Mine" 2634: 2582: 2476:Clear Range Granodiorite 2475: 2430:crystals. The tuff shows 2015:Deakin Volcanics red tuff 1744: 1371: 844: 299:Cullarin Horst (north of 278:Canberra region structure 2465:Clear Range Granodiorite 1204:Black Mountain Sandstone 1097:Transantarctic Mountains 543:was erupted followed by 456:) was raised higher. An 104:William Branwhite Clarke 3689:Cocos (Keeling) Islands 3164:Australian Mineralogist 2963:. Australian Government 2264:Late Silurian to early 1720:. These volcanics lack 1602:Mount Painter Volcanics 436:and animal organic and 18:Mount Painter Volcanics 3482:. Geoscience Australia 3337:. Geoscience Australia 3320:, ed H. L. White 1954 3298:. Geoscience Australia 3276:. Geoscience Australia 3254:. Geoscience Australia 3107:Cite journal requires 3001:ACT Heritage Council: 2983:Cite journal requires 2961:"Geoscience Australia" 2752: 2689:Booroomba Leucogranite 2651:Microcline K-feldspar 2599:Microcline K-feldspar 2573: 2492:Microcline K-feldspar 2452:Murrumbidgee Batholith 2393:Paddys River Volcanics 2377: 2242:. A coarse green grey 2164: 2016: 2008: 2000: 595: 495:Basin remained in the 432:reached and only fine 159: 114: 34: 3213:Australian Government 3065:Australian Government 3035:Australian Government 2750: 2567: 2375: 2292:Glebe Farm Adamellite 2162: 2014: 2006: 1998: 1243:Tidbinbilla Quartzite 1184:, north and south of 600:Molong-Monaro Terrane 593: 155: 143:Charles Throsby Smith 112: 32: 3827:Legislative Assembly 3724:Australia portal 3665:External territories 3649:Jervis Bay Territory 3635:Mainland territories 3583:Geology of Australia 2851:Magnetic inclination 2847:Magnetic declination 2637:Mineral Composition 2585:Mineral Composition 2478:Mineral Composition 2238:intrusions could be 2093:, and south through 1632:Yarralumla Formation 1252:Late Middle Silurian 633:, and conversion of 562:block is called the 219:. The ACT is in the 213:Australian continent 66:Yarralumla Formation 3322:Angus and Robertson 3143:on 28 December 2013 2045:and red and yellow 2025:Tuggeranong Parkway 1667:Lake Burley Griffin 1158:Late Early Silurian 1076:because of the low 1047:, and occasionally 468:Silurian deposition 345:Goodradigbee Graben 207:or downthrown into 167:Lake Burley Griffin 141:, a constable, and 137:was accompanied by 3993:Silurian volcanism 3736:Geology portal 3654:Northern Territory 3373:2008-07-25 at the 3369:Heritage Register 3009:2008-07-25 at the 2918:Blundell's Cottage 2753: 2635:Tharwa Adamellite 2574: 2378: 2312:Also known as the 2283:Murrumbidgee River 2184:Murrumbidgee River 2165: 2017: 2009: 2001: 1613:Xenoliths include 1554:and some have red 1257:Canberra Formation 1163:State Circle Shale 1105:isotopically dated 1015:, micaceous sandy 1007:, exposed east of 847:Chemical Analysis 845:Pittman Formation 716:Southern Highlands 708:Murrumbidgee River 596: 594:Dyke of teschenite 553:Murrumbidgee River 430:turbidity currents 424:off the side of a 422:turbidity currents 379:Delamerian Orogeny 368:Geological history 131:Murrumbidgee River 115: 62:volcanic eruptions 35: 3975: 3974: 3744: 3743: 3694:Coral Sea Islands 3624:Western Australia 3397:on 14 August 2008 3203:"Place ID 105733" 2681:Tharwa Adamellite 2678: 2677: 2674: 2673: 2626: 2625: 2622: 2621: 2527: 2526: 2523: 2522: 2402:Uriarra Volcanics 2314:Greenwood Granite 2155:Laidlaw Volcanics 1993: 1992: 1989: 1988: 1533: 1532: 1529: 1528: 1361:Ainslie Volcanics 1328:Hawkins Volcanics 1109:Australian Shield 991:Pittman Formation 988: 987: 984: 983: 515:layers included. 426:continental slope 260:Lachlan Fold Belt 171:volcanic activity 127:Lachlan Macquarie 81:million years ago 55:Pittman Formation 16:(Redirected from 4000: 3969:Australia portal 3870:Cities and towns 3864: 3842:Public transport 3771: 3764: 3757: 3748: 3734: 3733: 3722: 3721: 3720: 3684:Christmas Island 3667: 3637: 3576: 3569: 3562: 3553: 3519: 3507: 3501: 3498: 3492: 3491: 3489: 3487: 3476: 3470: 3469: 3451: 3438: 3431: 3425: 3424: 3413: 3407: 3406: 3404: 3402: 3393:. Archived from 3383: 3377: 3364: 3358: 3353: 3347: 3346: 3344: 3342: 3331: 3325: 3314: 3308: 3307: 3305: 3303: 3292: 3286: 3285: 3283: 3281: 3270: 3264: 3263: 3261: 3259: 3248: 3242: 3241: 3239: 3237: 3226: 3217: 3216: 3199: 3193: 3190: 3184: 3178: 3172: 3171: 3159: 3153: 3152: 3150: 3148: 3139:. Archived from 3132: 3126: 3123: 3117: 3116: 3110: 3105: 3103: 3095: 3093: 3092: 3081: 3075: 3074: 3072: 3071: 3051: 3045: 3044: 3042: 3041: 3021: 3015: 2999: 2993: 2992: 2986: 2981: 2979: 2971: 2969: 2968: 2957: 2930:Australian Plate 2883:Lake Tuggeranong 2790:, and about 15% 2779:, pinkish brown 2735:, and higher in 2632: 2628: 2580: 2576: 2572:Tracking Station 2473: 2469: 2322:Canberra Airport 1742: 1738: 1734:Deakin Volcanics 1661:in the South to 1369: 1365: 1345:, Mount Rogers, 1319:Walker Volcanics 1087:, consisting of 1027:and radiolarian 842: 838: 775:copper carbonate 625:, conversion of 623:saussuritisation 442:submarine trench 355:Long Plain Fault 340:Tantangara Fault 294:Ballallaba Fault 203:, uplifted into 192:Tectonic context 102:by the Reverend 21: 4008: 4007: 4003: 4002: 4001: 3999: 3998: 3997: 3978: 3977: 3976: 3971: 3962: 3906: 3865: 3856: 3780: 3775: 3745: 3740: 3728: 3718: 3716: 3708: 3663: 3658: 3633: 3628: 3609:South Australia 3599:New South Wales 3585: 3580: 3527: 3522: 3518:22, 2003, p. 46 3508: 3504: 3499: 3495: 3485: 3483: 3478: 3477: 3473: 3466: 3453: 3452: 3441: 3432: 3428: 3415: 3414: 3410: 3400: 3398: 3385: 3384: 3380: 3375:Wayback Machine 3365: 3361: 3354: 3350: 3340: 3338: 3333: 3332: 3328: 3315: 3311: 3301: 3299: 3294: 3293: 3289: 3279: 3277: 3272: 3271: 3267: 3257: 3255: 3250: 3249: 3245: 3235: 3233: 3228: 3227: 3220: 3201: 3200: 3196: 3191: 3187: 3179: 3175: 3161: 3160: 3156: 3146: 3144: 3134: 3133: 3129: 3124: 3120: 3106: 3096: 3090: 3088: 3083: 3082: 3078: 3069: 3067: 3053: 3052: 3048: 3039: 3037: 3023: 3022: 3018: 3011:Wayback Machine 3000: 2996: 2982: 2972: 2966: 2964: 2959: 2958: 2954: 2950: 2938: 2926: 2914: 2863:gravity anomaly 2859: 2854: 2837: 2826:In the ACT the 2824: 2819: 2809: 2805: 2699:Booroomba Rocks 2449: 2443:Pierces Creek. 2354:contact aureole 2116:, and deep red 1927: 1923: 1909: 1883: 1869: 1855: 1851: 1814: 1799: 1785: 1781: 1767: 1522: 1507: 1481: 1455: 1441: 1437: 1412: 1408: 1394: 1254: 1160: 1083:The Ordovician 961: 957: 945: 933: 890: 886: 875: 864: 836: 831: 728: 712:Snowy Mountains 588: 470: 387:South Australia 385:and in eastern 375: 370: 280: 272:New South Wales 194: 147:Charles Throsby 23: 22: 15: 12: 11: 5: 4006: 4004: 3996: 3995: 3990: 3980: 3979: 3973: 3972: 3967: 3964: 3963: 3961: 3960: 3955: 3950: 3945: 3940: 3935: 3930: 3925: 3920: 3914: 3912: 3908: 3907: 3905: 3904: 3899: 3894: 3889: 3884: 3879: 3873: 3871: 3867: 3866: 3859: 3857: 3855: 3854: 3849: 3844: 3839: 3834: 3829: 3824: 3819: 3814: 3809: 3804: 3799: 3794: 3788: 3786: 3782: 3781: 3776: 3774: 3773: 3766: 3759: 3751: 3742: 3741: 3739: 3738: 3726: 3713: 3710: 3709: 3707: 3706: 3704:Norfolk Island 3701: 3696: 3691: 3686: 3681: 3676: 3670: 3668: 3660: 3659: 3657: 3656: 3651: 3646: 3640: 3638: 3630: 3629: 3627: 3626: 3621: 3616: 3611: 3606: 3601: 3595: 3593: 3587: 3586: 3581: 3579: 3578: 3571: 3564: 3556: 3550: 3549: 3546: 3543: 3540: 3537: 3534: 3531: 3526: 3523: 3521: 3520: 3502: 3493: 3471: 3464: 3439: 3426: 3421:asud.ga.gov.au 3408: 3378: 3359: 3348: 3326: 3309: 3287: 3265: 3243: 3218: 3194: 3185: 3173: 3154: 3127: 3118: 3109:|journal= 3076: 3046: 3016: 2994: 2985:|journal= 2951: 2949: 2946: 2937: 2934: 2925: 2922: 2913: 2910: 2858: 2855: 2845: 2836: 2835:Magnetic field 2833: 2823: 2820: 2818: 2815: 2807: 2803: 2745: 2744: 2724:Granodiorite. 2691: 2690: 2683: 2682: 2676: 2675: 2672: 2671: 2668: 2664: 2663: 2660: 2656: 2655: 2652: 2648: 2647: 2644: 2640: 2639: 2624: 2623: 2620: 2619: 2616: 2612: 2611: 2608: 2604: 2603: 2600: 2596: 2595: 2592: 2588: 2587: 2559: 2558: 2545:with numerous 2525: 2524: 2521: 2520: 2517: 2513: 2512: 2509: 2505: 2504: 2501: 2497: 2496: 2493: 2489: 2488: 2485: 2481: 2480: 2467: 2466: 2454: 2453: 2448: 2445: 2404: 2403: 2395: 2394: 2387:Gudgenby River 2370: 2369: 2368:Adaminaby Beds 2310: 2309: 2308:Sutton Granite 2294: 2293: 2240:volcanic necks 2223: 2222: 2157: 2156: 2132:, pink potash 2112:, light green 1991: 1990: 1987: 1986: 1983: 1980: 1976: 1975: 1972: 1969: 1965: 1964: 1961: 1958: 1954: 1953: 1950: 1947: 1943: 1942: 1939: 1936: 1932: 1931: 1928: 1925: 1921: 1918: 1914: 1913: 1910: 1907: 1904: 1900: 1899: 1896: 1893: 1889: 1888: 1885: 1881: 1878: 1874: 1873: 1870: 1867: 1864: 1860: 1859: 1856: 1853: 1849: 1846: 1842: 1841: 1838: 1835: 1831: 1830: 1827: 1824: 1820: 1819: 1816: 1812: 1809: 1805: 1804: 1801: 1797: 1794: 1790: 1789: 1786: 1783: 1779: 1776: 1772: 1771: 1768: 1765: 1762: 1758: 1757: 1754: 1751: 1747: 1746: 1736: 1735: 1702: 1701: 1690:Molonglo River 1677:and primitive 1634: 1633: 1624:or early Late 1604: 1603: 1578:from the Late 1567:Molonglo River 1531: 1530: 1527: 1526: 1523: 1520: 1517: 1513: 1512: 1509: 1505: 1502: 1498: 1497: 1494: 1491: 1487: 1486: 1483: 1479: 1476: 1472: 1471: 1468: 1465: 1461: 1460: 1457: 1453: 1450: 1446: 1445: 1442: 1439: 1435: 1432: 1428: 1427: 1424: 1421: 1417: 1416: 1413: 1410: 1406: 1403: 1399: 1398: 1395: 1392: 1389: 1385: 1384: 1381: 1378: 1374: 1373: 1363: 1362: 1330: 1329: 1321: 1320: 1259: 1258: 1253: 1250: 1245: 1244: 1225:Black Mountain 1206: 1205: 1186:Black Mountain 1165: 1164: 1159: 1156: 1121: 1120: 993: 992: 986: 985: 982: 981: 978: 974: 973: 970: 966: 965: 962: 959: 955: 951: 950: 947: 943: 939: 938: 935: 931: 927: 926: 923: 919: 918: 915: 911: 910: 907: 903: 902: 899: 895: 894: 891: 888: 884: 880: 879: 876: 873: 869: 868: 865: 862: 858: 857: 854: 850: 849: 835: 832: 830: 827: 727: 724: 619:sericitisation 587: 584: 531:Formation and 478:Black Mountain 469: 466: 462:Black Mountain 450:Early Silurian 393:, and western 374: 371: 369: 366: 365: 364: 358: 357: 356: 347: 346: 343: 342: 341: 335: 334: 333: 324: 323: 317: 316: 315: 297: 296: 295: 289: 288: 287: 279: 276: 238:plate tectonic 193: 190: 24: 14: 13: 10: 9: 6: 4: 3: 2: 4005: 3994: 3991: 3989: 3986: 3985: 3983: 3970: 3965: 3959: 3956: 3954: 3951: 3949: 3946: 3944: 3941: 3939: 3936: 3934: 3931: 3929: 3926: 3924: 3921: 3919: 3916: 3915: 3913: 3909: 3903: 3900: 3898: 3895: 3893: 3890: 3888: 3885: 3883: 3880: 3878: 3875: 3874: 3872: 3868: 3863: 3853: 3850: 3848: 3845: 3843: 3840: 3838: 3835: 3833: 3830: 3828: 3825: 3823: 3820: 3818: 3815: 3813: 3810: 3808: 3805: 3803: 3800: 3798: 3795: 3793: 3790: 3789: 3787: 3783: 3779: 3772: 3767: 3765: 3760: 3758: 3753: 3752: 3749: 3737: 3732: 3727: 3725: 3715: 3714: 3711: 3705: 3702: 3700: 3697: 3695: 3692: 3690: 3687: 3685: 3682: 3680: 3677: 3675: 3672: 3671: 3669: 3666: 3661: 3655: 3652: 3650: 3647: 3645: 3642: 3641: 3639: 3636: 3631: 3625: 3622: 3620: 3617: 3615: 3612: 3610: 3607: 3605: 3602: 3600: 3597: 3596: 3594: 3592: 3588: 3584: 3577: 3572: 3570: 3565: 3563: 3558: 3557: 3554: 3547: 3544: 3541: 3538: 3535: 3532: 3529: 3528: 3524: 3517: 3514: 3513: 3510:P. Tregoning: 3506: 3503: 3497: 3494: 3481: 3475: 3472: 3467: 3465:9780646487342 3461: 3457: 3450: 3448: 3446: 3444: 3440: 3436: 3430: 3427: 3422: 3418: 3412: 3409: 3396: 3392: 3388: 3382: 3379: 3376: 3372: 3368: 3363: 3360: 3357: 3352: 3349: 3336: 3330: 3327: 3323: 3319: 3313: 3310: 3297: 3291: 3288: 3275: 3269: 3266: 3253: 3247: 3244: 3231: 3225: 3223: 3219: 3214: 3210: 3209: 3204: 3198: 3195: 3189: 3186: 3182: 3177: 3174: 3169: 3165: 3158: 3155: 3142: 3138: 3135:Mark (2006). 3131: 3128: 3122: 3119: 3114: 3101: 3086: 3080: 3077: 3066: 3062: 3061: 3056: 3050: 3047: 3036: 3032: 3031: 3026: 3020: 3017: 3013: 3012: 3008: 3005: 2998: 2995: 2990: 2977: 2962: 2956: 2953: 2947: 2945: 2943: 2935: 2933: 2931: 2923: 2921: 2919: 2911: 2909: 2906: 2904: 2903:Mount Stromlo 2899: 2897: 2892: 2888: 2884: 2880: 2876: 2872: 2868: 2864: 2857:Gravity field 2856: 2852: 2848: 2844: 2841: 2834: 2832: 2829: 2822:Seismic waves 2821: 2816: 2814: 2811: 2801: 2797: 2793: 2789: 2786: 2782: 2778: 2774: 2769: 2766: 2762: 2758: 2749: 2742: 2741: 2740: 2738: 2734: 2730: 2727:It is low in 2725: 2723: 2722:Shannons Flat 2719: 2716: 2712: 2708: 2704: 2700: 2696: 2688: 2687: 2686: 2680: 2679: 2666: 2665: 2658: 2657: 2650: 2649: 2642: 2641: 2638: 2633: 2630: 2629: 2614: 2613: 2606: 2605: 2598: 2597: 2590: 2589: 2586: 2581: 2578: 2577: 2571: 2566: 2562: 2556: 2555: 2554: 2552: 2548: 2544: 2540: 2536: 2532: 2515: 2514: 2507: 2506: 2499: 2498: 2491: 2490: 2483: 2482: 2479: 2474: 2471: 2470: 2464: 2463: 2462: 2459: 2451: 2450: 2446: 2444: 2441: 2437: 2433: 2429: 2424: 2420: 2416: 2412: 2409: 2401: 2400: 2399: 2392: 2391: 2390: 2388: 2383: 2374: 2367: 2366: 2365: 2363: 2359: 2355: 2351: 2350:metamorphosed 2347: 2343: 2339: 2335: 2332:, milky grey 2331: 2327: 2323: 2319: 2315: 2307: 2306: 2305: 2303: 2299: 2291: 2290: 2289: 2286: 2284: 2279: 2277: 2272: 2269: 2267: 2262: 2259: 2255: 2253: 2252:magma chamber 2249: 2245: 2241: 2237: 2232: 2230: 2227: 2220: 2219: 2218: 2216: 2212: 2207: 2205: 2201: 2197: 2193: 2189: 2185: 2181: 2177: 2173: 2170: 2161: 2154: 2153: 2152: 2150: 2147: 2143: 2139: 2135: 2131: 2127: 2123: 2119: 2115: 2111: 2106: 2104: 2100: 2096: 2092: 2088: 2084: 2080: 2076: 2072: 2068: 2064: 2060: 2056: 2052: 2048: 2044: 2040: 2036: 2033: 2030: 2026: 2022: 2013: 2005: 1997: 1985:100 ppm 1981: 1978: 1977: 1974:125 ppm 1970: 1967: 1966: 1963:210 ppm 1959: 1956: 1955: 1948: 1945: 1944: 1941:540 ppm 1937: 1934: 1933: 1919: 1916: 1915: 1905: 1902: 1901: 1894: 1891: 1890: 1879: 1876: 1875: 1865: 1862: 1861: 1847: 1844: 1843: 1836: 1833: 1832: 1825: 1822: 1821: 1810: 1807: 1806: 1795: 1792: 1791: 1777: 1774: 1773: 1763: 1760: 1759: 1755: 1752: 1749: 1748: 1743: 1740: 1739: 1733: 1732: 1731: 1729: 1727: 1723: 1719: 1715: 1711: 1707: 1700:Yass Subgroup 1699: 1698: 1697: 1695: 1691: 1687: 1682: 1680: 1676: 1672: 1668: 1664: 1660: 1656: 1652: 1648: 1642: 1639: 1631: 1630: 1629: 1627: 1623: 1622:Wenlock epoch 1618: 1616: 1611: 1609: 1601: 1600: 1599: 1596: 1592: 1587: 1585: 1582:epoch of the 1581: 1576: 1572: 1568: 1564: 1560: 1557: 1553: 1549: 1545: 1542: 1538: 1518: 1515: 1514: 1503: 1500: 1499: 1492: 1489: 1488: 1477: 1474: 1473: 1466: 1463: 1462: 1451: 1448: 1447: 1433: 1430: 1429: 1422: 1419: 1418: 1404: 1401: 1400: 1390: 1387: 1386: 1382: 1379: 1376: 1375: 1370: 1367: 1366: 1360: 1359: 1358: 1356: 1352: 1348: 1344: 1340: 1336: 1327: 1326: 1325: 1318: 1317: 1316: 1313: 1309: 1304: 1302: 1298: 1294: 1290: 1285: 1283: 1280: 1276: 1272: 1268: 1264: 1261:In the 1840s 1256: 1255: 1251: 1249: 1242: 1241: 1240: 1238: 1234: 1231:period, late 1230: 1226: 1222: 1218: 1214: 1211: 1203: 1202: 1201: 1199: 1195: 1191: 1187: 1183: 1179: 1174: 1170: 1162: 1161: 1157: 1155: 1152: 1149: 1145: 1142: 1138: 1134: 1130: 1126: 1118: 1117: 1116: 1112: 1110: 1106: 1102: 1098: 1094: 1090: 1086: 1081: 1079: 1075: 1071: 1067: 1062: 1059: 1054: 1050: 1046: 1042: 1038: 1034: 1030: 1026: 1022: 1018: 1014: 1010: 1006: 1002: 1001:Captains Flat 998: 990: 989: 976: 975: 972:168 ppm 968: 967: 953: 952: 941: 940: 929: 928: 921: 920: 913: 912: 905: 904: 897: 896: 882: 881: 871: 870: 860: 859: 855: 852: 851: 848: 843: 840: 839: 833: 828: 826: 824: 820: 816: 815:native silver 812: 808: 804: 800: 796: 792: 788: 784: 779: 776: 772: 769:A deposit of 767: 765: 761: 757: 753: 749: 745: 741: 737: 733: 725: 723: 721: 717: 713: 709: 705: 702: 698: 693: 689: 686: 682: 679: 675: 670: 668: 664: 660: 656: 652: 648: 644: 640: 636: 632: 628: 624: 620: 616: 612: 608: 603: 601: 592: 585: 583: 581: 577: 574:beneath. The 573: 572:oceanic crust 570: 565: 561: 556: 554: 550: 546: 542: 538: 534: 530: 526: 522: 516: 514: 510: 506: 500: 498: 497:Captains Flat 494: 490: 486: 482: 479: 475: 472:State Circle 467: 465: 463: 459: 455: 451: 445: 443: 439: 435: 431: 427: 423: 419: 415: 411: 406: 404: 400: 396: 392: 388: 384: 380: 372: 367: 362: 359: 354: 353: 352: 351: 350: 344: 339: 338: 337:Cotter Horst 336: 331: 330: 329: 328: 327: 322: 318: 313: 312: 310: 306: 302: 298: 293: 292: 290: 286:Narongo Fault 285: 284: 282: 281: 277: 275: 273: 269: 265: 261: 256: 254: 250: 246: 241: 239: 234: 230: 226: 222: 218: 214: 210: 206: 202: 198: 191: 189: 187: 183: 178: 176: 172: 168: 164: 158: 154: 152: 148: 144: 140: 139:James Vaughan 136: 132: 128: 124: 120: 111: 107: 105: 101: 97: 93: 89: 86:In the 1840s 84: 82: 78: 74: 71: 67: 63: 58: 56: 52: 48: 44: 40: 31: 27: 19: 3933:Murrumbidgee 3902:Williamsdale 3811: 3643: 3525:Bibliography 3515: 3511: 3505: 3496: 3484:. Retrieved 3474: 3455: 3434: 3429: 3420: 3411: 3399:. Retrieved 3395:the original 3390: 3381: 3362: 3351: 3339:. Retrieved 3329: 3317: 3312: 3300:. Retrieved 3290: 3278:. Retrieved 3268: 3256:. Retrieved 3246: 3234:. Retrieved 3206: 3197: 3188: 3180: 3176: 3167: 3163: 3157: 3145:. Retrieved 3141:the original 3130: 3121: 3100:cite journal 3089:. Retrieved 3079: 3068:. Retrieved 3058: 3049: 3038:. Retrieved 3028: 3019: 3002: 2997: 2976:cite journal 2965:. Retrieved 2955: 2939: 2927: 2915: 2907: 2900: 2860: 2842: 2838: 2825: 2812: 2770: 2754: 2726: 2718:Granodiorite 2695:Leucogranite 2692: 2684: 2659:Plagioclase 2636: 2607:Plagioclase 2584: 2560: 2528: 2500:Plagioclase 2477: 2455: 2417:deposits of 2405: 2396: 2379: 2360:and spotted 2313: 2311: 2295: 2287: 2280: 2276:Mount Taylor 2273: 2270: 2263: 2260: 2256: 2233: 2224: 2208: 2204:Ludlow epoch 2166: 2146:saccharoidal 2107: 2075:Weston Creek 2018: 1730: 1703: 1683: 1643: 1635: 1619: 1612: 1605: 1591:Mount Majura 1588: 1535:Named after 1534: 1331: 1322: 1305: 1286: 1260: 1246: 1237:fanglomerate 1233:Llandoverian 1207: 1169:Llandoverian 1166: 1153: 1122: 1113: 1082: 1063: 1041:radiolarians 1025:argillaceous 994: 980:64 ppm 846: 807:hydrozincite 803:hemimorphite 787:aurichalcite 783:Paddys River 780: 768: 729: 694: 690: 671: 611:metamorphism 604: 597: 557: 525:Williamsdale 517: 501: 471: 458:unconformity 446: 407: 405:in the ACT. 376: 348: 325: 321:Williamsdale 257: 242: 195: 179: 160: 156: 116: 85: 65: 59: 54: 38: 36: 26: 3958:Tidbinbilla 3887:Oaks Estate 3486:28 December 3341:28 December 3302:28 December 3280:28 December 3258:28 December 3236:28 December 3147:28 December 2891:Oaks Estate 2781:titanaugite 2775:altered to 2715:Clear Range 2703:crystalline 2570:Tidbinbilla 2539:Clear Range 2415:pyroclastic 2340:, and with 2244:rhyodacitic 2226:Porphyrytic 2194:, Chapman, 2130:plagioclase 2122:phenocrysts 2095:Tuggeranong 2051:Tuggeranong 2032:rhyodacitic 2029:interbedded 1308:Narrabundah 1267:brachiopods 1188:, and from 1133:Brachiopods 1129:graptolites 1127:containing 1119:Acton Shale 1099:. Detrital 1058:Oaks Estate 1049:brachiopods 1037:graptolites 791:bronchanite 720:Lake George 674:Googong Dam 667:pumpellyite 627:plagioclase 615:greenschist 537:sedimentary 489:Wagga Wagga 454:Wagga Wagga 408:During the 383:Broken Hill 305:Oaks Estate 240:movements. 233:Proterozoic 229:Tasman Line 135:Joseph Wild 125:, Governor 119:Lake George 92:brachiopods 70:sedimentary 3982:Categories 3953:Queanbeyan 3817:Government 3604:Queensland 3091:2007-10-11 3070:2007-10-11 3040:2007-10-11 2967:2007-10-11 2948:References 2871:Yass River 2817:Geophysics 2810:Ti)O(OH). 2785:kaersutite 2777:serpentine 2761:teschenite 2693:Booroomba 2547:inclusions 2516:Muscovite 2413:flows and 2342:hornblende 2229:intrusions 2172:ignimbrite 2169:rhydacitic 2103:celadonite 2085:, through 2035:ignimbrite 1722:cordierite 1671:trilobites 1663:Yarralumla 1638:Yarralumla 1615:jasperised 1580:Wenlockian 1552:cordierite 1544:ignimbrite 1271:trilobites 1148:Ordovician 1085:turbidites 1009:Queanbeyan 834:Ordovician 823:zincsilite 795:caledonite 704:teschenite 541:rhyodacite 535:Formation 529:Yarralumla 521:Queanbeyan 485:turbidites 410:Palaeozoic 389:, western 373:Ordovician 307:, most of 301:Queanbeyan 245:Antarctica 221:Tasmanides 123:Yass River 96:trilobites 64:, but the 43:Ordovician 3807:Geography 3797:Education 3401:6 January 3170:: 83–100. 2912:Heat flow 2879:milligals 2792:magnetite 2788:amphibole 2737:potassium 2711:Muscovite 2551:mylonitic 2440:limestone 2421:. A fine 2382:turbidite 2346:xenoliths 2300:, Melba, 2221:Porphyrys 2215:limestone 2200:Ludlovian 2188:Belconnen 2180:Volcanics 2077:north of 2071:MacGregor 2067:Charnwood 2043:siltstone 2039:sandstone 1756:% or ppm 1718:limestone 1710:sandstone 1571:aluminium 1556:almandine 1548:sediments 1383:% or ppm 1273:from the 1219:and grey 1217:siltstone 1213:sandstone 1198:Ngunnawal 1173:lithology 1137:conodonts 1089:greywacke 1080:content. 1074:strontium 1045:conodonts 1013:sandstone 1005:greywacke 856:% or ppm 829:Lithology 799:cerussite 678:Psammitic 651:Belconnen 523:and near 505:limestone 481:Sandstone 418:Sediments 414:subducted 403:obduction 197:Tectonics 186:Batholith 151:limestone 77:siltstone 51:Australia 3928:Molonglo 3923:Gudgenby 3877:Canberra 3619:Victoria 3614:Tasmania 3371:Archived 3324:, p. 143 3007:Archived 2924:Movement 2800:titanium 2796:analcime 2783:, brown 2707:granites 2667:Biotite 2615:Biotite 2543:foliated 2508:Biotite 2436:Porphyry 2428:feldspar 2423:ashstone 2358:hornfels 2336:, black 2330:feldspar 2326:Silurian 2302:McKellar 2266:Devonian 2236:Silurian 2142:Tonalite 2134:feldspar 2118:hematite 2099:hematite 1714:ashstone 1679:crinoids 1655:Red Hill 1626:Silurian 1584:Silurian 1312:Ashstone 1293:Kingston 1289:Fyshwick 1279:Duntroon 1275:Silurian 1229:Silurian 1093:phyllite 1078:feldspar 1023:, black 1021:mudstone 819:rozenite 811:linarite 764:concrete 756:Pialligo 685:pellitic 663:prehnite 643:titanite 639:chlorite 586:Devonian 580:granites 569:basaltic 560:tectonic 549:rhyolite 513:ashstone 399:Cambrian 395:Tasmania 391:Victoria 268:Victoria 253:Gondwana 217:Gondwana 175:Devonian 121:and the 100:Duntroon 73:mudstone 47:Silurian 3943:Orroral 3897:Uriarra 3852:Symbols 3822:History 3812:Geology 3792:Economy 3785:General 2942:Podzols 2867:gravity 2773:olivine 2733:calcium 2643:Quartz 2591:Quartz 2535:Thredbo 2484:Quartz 2432:bedding 2338:biotite 2318:granite 2234:Middle 2138:biotite 2128:, grey 2114:epidote 2110:calcite 2079:Chapman 2063:breccia 1845:  1788:13.33% 1770:72.99% 1575:pelitic 1541:Dacitic 1431:  1415:14.28% 1263:fossils 1144:fossils 1141:sponges 1101:zircons 1070:calcium 1053:sponges 1033:bedding 893:13.76% 867:71.23% 722:Fault. 701:olivine 647:epidote 635:biotite 607:terrane 264:Terrane 209:grabens 173:in the 88:fossils 3948:Paddys 3918:Cotter 3911:Rivers 3892:Tharwa 3837:Police 3832:People 3591:States 3462:  2887:Kambah 2765:Kambah 2662:29.1% 2654:29.7% 2646:34.1% 2610:34.7% 2602:21.0% 2594:36.0% 2531:Tharwa 2511:16.1% 2503:34.2% 2487:33.9% 2408:dacite 2362:schist 2334:quartz 2196:Kambah 2192:Latham 2149:galena 2126:quartz 2120:. The 2083:Fisher 2021:Deakin 1952:0.03% 1930:0.06% 1912:0.22% 1898:0.49% 1887:1.12% 1858:0.53% 1829:1.73% 1818:2.98% 1803:3.78% 1753:oxide 1750:order 1726:garnet 1595:Harman 1573:-rich 1563:Jasper 1559:garnet 1525:0.59% 1511:2.05% 1496:2.15% 1470:2.61% 1444:0.79% 1426:3.42% 1397:66.8% 1380:oxide 1377:order 1343:Spence 1339:Fraser 1335:Dunlop 1301:Parkes 1297:Barton 1210:quartz 1190:Lawson 1178:Parkes 1171:. Its 1066:sodium 964:0.13% 949:3.54% 937:1.02% 925:0.31% 917:1.90% 909:0.05% 901:4.74% 878:0.64% 853:oxide 821:, and 771:galena 760:gravel 752:Quarry 748:copper 746:, and 740:silver 732:mining 730:Minor 726:Mining 681:schist 659:Kambah 657:, and 631:albite 576:magmas 564:Cotter 509:dacite 499:area. 493:Monaro 438:silica 225:orogen 205:horsts 201:faults 3847:Sport 2896:weigh 2670:7.1% 2618:8.3% 2519:1.8% 2495:8.9% 2458:Cooma 2352:in a 2344:rich 2298:Flynn 2211:shale 2209:Some 2087:Woden 2047:shale 1872:1.6% 1840:0.9% 1706:shale 1675:coral 1659:Woden 1485:2.5% 1459:3.8% 1351:Melba 1347:Flynn 1221:shale 1194:Crace 1192:, to 1182:Acton 1125:shale 1029:chert 1017:shale 766:mix. 655:Duffy 474:Shale 361:Cowra 309:Kowen 249:China 163:Acton 68:is a 3938:Naas 3882:Hall 3802:Flag 3488:2013 3460:ISBN 3403:2019 3343:2013 3304:2013 3282:2013 3260:2013 3238:2013 3149:2013 3113:help 3014:2004 2989:help 2936:Soil 2875:μm·s 2861:The 2828:Moho 2757:dyke 2731:and 2729:iron 2720:and 2419:tuff 2411:lava 2248:Holt 2176:tuff 2124:are 2091:Hume 2081:and 2069:and 2059:tuff 2055:lava 2019:The 1949:MnO 1895:MgO 1837:FeO 1826:CaO 1716:and 1665:and 1657:and 1608:Öpik 1493:MgO 1467:CaO 1423:FeO 1355:Hall 1353:and 1299:and 1269:and 1196:and 1139:and 1072:and 1051:and 922:CaO 914:MgO 906:MnO 898:FeO 773:and 762:and 744:lead 736:gold 714:and 697:dyke 683:and 545:tuff 533:Yass 511:and 476:and 434:clay 94:and 37:The 2806:(Mg 2759:of 2533:to 2356:to 1982:Sr 1979:16 1971:Zr 1968:15 1960:Rb 1957:14 1946:13 1938:Ba 1935:12 1917:11 1906:TiO 1903:10 1764:SiO 1724:or 1519:TiO 1391:SiO 1265:of 977:Sr 969:Rb 872:TiO 861:SiO 754:at 699:of 637:to 629:to 266:in 90:of 3984:: 3442:^ 3419:. 3389:. 3221:^ 3211:. 3205:. 3166:. 3104:: 3102:}} 3098:{{ 3063:. 3057:. 3033:. 3027:. 2980:: 2978:}} 2974:{{ 2755:A 2709:. 2278:. 2151:. 2041:, 2037:, 1892:9 1884:O 1880:Na 1877:8 1866:CO 1863:7 1848:Fe 1834:6 1823:5 1815:O 1808:4 1800:O 1793:3 1778:Al 1775:2 1761:1 1728:. 1712:, 1708:, 1681:. 1673:, 1561:. 1516:9 1508:O 1504:Na 1501:8 1490:7 1482:O 1475:6 1464:5 1456:O 1449:4 1434:Fe 1420:3 1405:Al 1402:2 1388:1 1349:, 1341:, 1337:, 1295:, 1291:, 1200:. 1180:, 1135:, 1068:, 1043:, 1039:, 1019:, 946:O 934:O 930:Na 883:Al 817:, 813:, 809:, 805:, 801:, 797:, 793:, 789:, 742:, 738:, 695:A 653:, 645:, 641:, 621:, 444:. 311:) 303:, 274:. 255:. 133:. 83:. 3770:e 3763:t 3756:v 3575:e 3568:t 3561:v 3490:. 3468:. 3423:. 3405:. 3345:. 3306:. 3284:. 3262:. 3240:. 3215:. 3168:3 3151:. 3115:) 3111:( 3094:. 3073:. 3043:. 2991:) 2987:( 2970:. 2808:4 2804:2 1926:5 1924:O 1922:2 1920:P 1908:2 1882:2 1868:2 1854:3 1852:O 1850:2 1813:2 1811:H 1798:2 1796:K 1784:3 1782:O 1780:2 1766:2 1521:2 1506:2 1480:2 1478:H 1454:2 1452:K 1440:3 1438:O 1436:2 1411:3 1409:O 1407:2 1393:2 960:5 958:O 956:2 954:P 944:2 942:K 932:2 889:3 887:O 885:2 874:2 863:2 665:- 75:/ 20:)

Index

Mount Painter Volcanics

Ordovician
Silurian
Australia
volcanic eruptions
sedimentary
mudstone
siltstone
million years ago
fossils
brachiopods
trilobites
Duntroon
William Branwhite Clarke

Lake George
Yass River
Lachlan Macquarie
Murrumbidgee River
Joseph Wild
James Vaughan
Charles Throsby Smith
Charles Throsby
limestone
Acton
Lake Burley Griffin
volcanic activity
Devonian
Australian Capital Territory

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