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provided further exposures and obliterated others. Today dykes are mainly in the northern half of the quarry, but at least one extends across the excavation floor in the isolated columnar stacks. They are of interest due to their inclusions of xenoliths and xenocrysts, which are believed to represent fragments of the earth's mantle incorporated in
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Following site inspections and lengthy consultations between the
Metropolitan Water, Sewerage and Drainage Board, NSW Heritage Council, NSW Planning Commission, and other key agencies a Permanent Conservation Order was placed over the site in 1983. It was transferred onto the State Heritage Register
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The Bombo Latite Member was subsequently intruded by at least five basaltic (Monchique) dykes of probable
Tertiary age which flowed around and between the columns of latite often taking 90-degree changes in direction. Early workers mapped and described these dykes, but subsequent quarry development
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A capping of cream-coloured weathered latite, still retaining the characteristic porphyritic texture, maybe studied at the top of the northern and western quarry faces. This sharply-defined zone of surface weathering and soil formation overlies relatively fresh rock exhibiting columnar jointing.
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Bombo
Headland Quarry Geological site is of research/technical significance in the numerous dykes which cut the Permian Bombo Latite. One of the dykes is geologically unique and contains abundant xenoliths which represent material brought up to the Earth's mantle, about 80 kilometres below the
395:, and the range of compositions are unique and are not represented anywhere else in the world. The Bombo Latite Member is also of international scientific significance in providing one of several samples upon which the concept and limits of Kiaman Magnetic Interval were defined. Like rocks of
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dips below sea level and is overlain by about 20m of porphyritic basalt, termed Bombo Latite member. The contact between the two units is well-exposed in the cliff section at the eastern end of the two points comprising the headland section. The red-brown colour (due to oxidization of
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Two units of the Late
Permian Gerringong volcanic facies are exposed on Bombo Headland. The Kiama Sandstone member forms a narrow wave-cut platform and adjacent vertical cliff face around the south-eastern extremity of the quarry. To the north, the
253:'s School of Earth Sciences. The quarry was owned by the Metropolitan Water, Sewerage, and Drainage Board and it was proposed that a pollution control plant be constructed on the floor of the disused quarry. It also made an appearance in
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or volcanic breccias are developed in some areas of the quarry. E.g. in the south-western portion near the access road. This lithology is readily distinguished from the latter by its chaotic appearance and light-coloured matrix.
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In 1979 a nomination was received from the
Geological Society of Australia (NSW Division) for the Bombo Quarry. The importance of the geological features was brought to the Heritage Council's attention by Dr. Suzanne Wass of
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5–5 meters in height stand adjacent to the coast between the north and south parts of the quarry; just to the north the sea wall exposes cross-sections of the columns 1-2.5 metres in diameter, resulting in a
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age throughout the world, the latite shows a reversed polarity (at the time of its extrusion the North and South magnetic poles were reversed). This interval, named after
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rock sequences. The area is of high educational value. In addition, the area is scenically attractive and has considerable potential for recreational and tourist use.
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occurring as rounded fragments and boulders embedded in the monchiquite. From a deeper level of what was probably the same dyke, Wilshire & Binns (1961) recorded
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and glimmerite as the dominant xenoliths. Present exposures of most of the other dykes appear to lack macroscopically visible xenoliths.
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published by the State of New South Wales (Department of
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Petrographic descriptions of the latite emphasise its conspicuous porphyritic texture; large
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Text is licensed by State of New South Wales (Department of
Planning and Environment) under
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is a heritage-listed former quarry and now geological site located on a coastal
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originating from within that zone. Sussmilch (1905) described xenoliths of
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Location of Bombo
Headland Quarry Geological Site in New South Wales
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surface of
Eastern Australia. The mineral assemblages including
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Bombo
Headland Quarry Geological Site was listed on the
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This Knowledge (XXG) article was originally based on
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with minor clinopyroxene are set in a groundmass of
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Bombo Headland Quarry Geological Site; Bombo Quarry
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575:"Bombo Headland Quarry Geological Site"
566:"Bombo Headland Quarry Geological Site"
486:New South Wales State Heritage Register
481:"Bombo Headland Quarry Geological Site"
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416:New South Wales State Heritage Register
256:Mighty Morphin Power Rangers: The Movie
238:New South Wales State Heritage Register
594:Bombo Headland Quarry Geological Site
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24:Bombo Headland Quarry Geological Site
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323:. The latter is commonly vesicular.
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647:Geologic formations of Australia
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259:as part of the planet Phaedos.
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551:Jaquet 1905 & Harper 1915
428:Stone Fleet (New South Wales)
607:, accessed on 1 June 2018.
596:, entry number 00177 in the
573:Attraction Homepage (2007).
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130:state heritage (landscape)
79:34.6499919°S 150.8633683°E
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84:-34.6499919; 150.8633683
531:Internet Movie Database
154:Geological site or area
652:Bombo, New South Wales
443:New South Wales portal
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642:Quarries in Australia
624:at Wikimedia Commons
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47:Municipality of Kiama
407:correlation of Late
251:Macquarie University
162:Landscape – Natural
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315:with interstitial
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620:Media related to
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535:. Retrieved
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364:hornblendite
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325:Agglomerates
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213:Bombo Quarry
138:2 April 1999
100:Sydney Water
18:
583:Attribution
342:hypersthene
306:phenocrysts
299:labradorite
267:Description
82: /
70:150°51′48″E
58:Coordinates
53:, Australia
631:Categories
450:References
409:Palaeozoic
360:pyroxenite
352:peridotite
321:iron oxide
313:microlites
232:region of
135:Designated
67:34°39′00″S
602:CC-BY 4.0
510:CC-BY 4.0
381:amphibole
356:enstatite
279:haematite
274:sandstone
263:in 1999.
230:Illawarra
228:, in the
493:. H00177
422:See also
393:ilmenite
385:pyroxene
317:chlorite
310:feldspar
303:andesine
222:headland
159:Category
38:Location
605:licence
568:. 2007.
537:8 April
513:licence
397:Permian
377:apatite
287:columns
244:History
497:1 June
389:spinel
349:augite
345:gabbro
338:magmas
283:latite
401:Kiama
226:Bombo
95:Owner
43:Bombo
539:2019
499:2018
391:and
319:and
151:Type
127:Type
301:to
224:at
146:177
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
