Knowledge

Portland stone

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929: 614:'s marble quarries was imported by Albion Stone and applied to the extraction of Portland stone. This new technology eliminated the need for blasting, significantly improved the quarries' environmental performance and removed the potential for any possible damage to the stone being quarried through shock. Full account of the local jointing pattern is made when deciding the position and orientation of cuts. Once the quarry faces have been cut, the stone is gently displaced hydraulically. This is done using "hydro-bags", which are thin, flat, steel bags or envelopes that when inflated with water under moderate pressure, are capable of producing the forces necessary to loosen the stone to the point where it can be easily removed using large wheeled 419:" or "ooliths" (from the Greek for "egg-shaped" or "egg-stone"), became partially cemented together (or lithified) by more calcite, to form the oolitic limestone that is called Portland stone. The degree of cementation in Portland stone is such that the stone is sufficiently well cemented to allow it to resist weathering, but not so well cemented that it cannot be readily worked (cut and carved) by masons. This is one of the reasons why Portland stone is so favoured as a monumental and architectural stone. Geoff Townson conducted three years doctoral research on the Portlandian, being the first to describe the patch-reef facies and Dorset-wide sedimentation details. Ian West of the School of Ocean and Earth Sciences at 1746: 698: 837: 302: 603:, where a series of short, small diameter (typically 30 mm) holes are drilled in a line where a cut is to be made. One plug and two feathers were inserted into each hole and each plug is hit in turn with a sledgehammer until the stone yields to the extreme tensile stresses produced. Most stone is many times weaker in tension than in compression, plugs and feathers utilize this fact. It is also worth noting that stone tends to split much more easily parallel to 679: 631: 457: 510: 660: 131: 443:'s choice of Portland for the new St Paul's Cathedral was a great boost for the quarries and established Portland as London's choice of building stone. The island was connected by railway to the rest of the country from 1865. Albion Stone PLC has been quarrying and mining Portland stone since 1984. Portland Stone Firms Ltd have been quarrying Portland stone since 1994. 651:
back without placing any stress on the resulting blocks. This method of extraction is significantly more expensive than blasting, but results in a higher yield thereby saving valuable reserves for future generations. The environmental benefits are substantial as mining significantly reduces the impact on wildlife and the local community with reduced noise and dust.
561:, located near Southwell has been open cast quarried over the last 80 years and is one of three privately owned quarries by Portland Stone Firms Ltd, the largest landholder on the island. The quarry is nearing the end of its life and will be regenerated as a holiday caravan park to boost local tourism on the island. 650:
method. The mine is advanced by extracting the stone using an abrasive tool chain cutter mounted on a machine. Slots are cut into the top, bottom, sides and middle of the stone. A flat steel pillow is inserted into the middle cut and slowly inflated with water. The stones are gently broken off at the
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The calcite gradually accumulated (by accretion) around the fragments of shell in concentric layers, forming small balls (of less than 0.5 mm diameter). This process is similar to the way in which a snowball grows in size as it is rolled around in the snow. Over time, countless billions of these
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All of the stone used by Wren was transported by sailing barge from Portland to the centre of London via the sea and then up the Thames. Wren's widespread use of Portland stone firmly established it as London's "local stone" and as one of the best-loved British building stones. Other famous London
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is found towards the middle of the island and being actively open cast quarried. There are over 20 years of reserves left which is privately owned by Portland Stone Firms. Open cast quarrying provides quicker extraction of raw block dimension stone whilst maintaining its integrity. The majority of
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has been operational since the late 18th century. It has been leased from The Crown Estate since 1979, and in 2002 it became the site of the first Portland stone mine by Albion Stone PLC. Extraction from this site is now completely underground, with the original Bowers Mine in the extreme southern
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at Church Ope Cove, Portland. The original structure was probably built around 1080, rebuilt around 1259 and rebuilt yet again around 1450, which is the likely date of the walls seen today. The first known Portland stone quarries were situated on the northeastern coast of the Isle, close to Rufus
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Independent Quarry and Admiralty Quarry are both owned by The Crown Estate and have been leased since 1982. These quarries have been worked since the mid-19th century with the final dimension stones coming out of Independent in 2006, although some stocks of Portland stone block still remain.
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and purchased the northern part of the site in 2006. The majority of the southern reserves lie under the grounds of the local cricket club. To avoid disturbing the site at surface level, the company has applied and received permission to extract the stone using mining rather than quarrying
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Portland stone formed in a marine environment, on the floor of a shallow, warm, sub-tropical sea probably near land (as evidenced by fossilized driftwood, which is not uncommon). When seawater is warmed by the sun, its capacity to hold dissolved gas is reduced; consequently, dissolved
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Once quarries have been worked they are then restored. The Portland Sculpture and Quarry Trust was formed in 1983 and is dedicated to preserving a knowledge and understanding of stone and the landscape from which it comes. The main non-working quarry remains
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end of the quarry and the High Wall Extraction on the eastern and south east boundaries. High Wall Extraction is a series of small mines that extract otherwise wasted stone that sits between the final faces of the quarry and the actual boundary of the site.
407:) which covered the sea floor. Small particles of sand or organic detritus, such as shell fragments, formed a nucleus, which became coated with layers of calcite as they were rolled around in the muddy micrite. Portland stone measures 3.5 on the 574:
is located on the eastern side of the island and is a part of the open cast quarries used for St Paul's Cathedral. Privately owned by Portland Stone Firms Limited there are over 20 years of reserves left and still being actively quarried.
399:) as a precipitate. The process of limescale build up in a kettle in hard-water areas is similar. Calcium carbonate is the principal constituent of most limestones. Billions of minute crystals of precipitated calcium carbonate (called 578:
The coastal strip toward the southern tip of the island has permission to be worked by Portland Stone Firms and will provide in excess of 30 years of reserves. Permission has been granted for this to be open cast quarried.
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is the first completely new mine on Portland (not a mine as an extension from an existing quarry). Albion Stone Plc began the process to open this mine in 2015 and reserves are estimated to last for 50 years (2066).
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Architects and Planning Consultants, it was completed in 2007 at a cost of over ยฃ6 million and bears the names of over 16,000 service personnel of the British Armed Forces killed since the Second World War.
537:(SSSI). Albion Stone PLC now extract all their stone through mining which dramatically reduces the impact on the environment and local residents. Jordan's Mine is currently the biggest mine on Portland. 963:, based in Keppel Street, has a Portland stone faรงade to complete its stripped Classical design. After the Second World War (1939โ€“1945), the bombed out centres of many English towns and cities, such as 755:, also constructed during the 14th Century, are built of Portland stone. Its superb characteristics have ensured a popularity amongst masons and architects that has endured ever since. The East side of 520:
is part of the Inmosthay Quarry in the centre of the island, which also includes Fancy Beach. The quarry has been worked since the late 19th century. Albion Stone leases the southern section from
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Stone has been quarried on Portland since Roman times and was being shipped to London in the 14th century. Extraction as an industry began in the early 17th century, with shipments to London for
599:, chosen because of its relative non-shattering properties. When fired the gunpowder produced a "heave" which dislodged the rock from its natural bed, hopefully undamaged. Stone was cut using 533:
to shape the blocks. This process avoids the use of dusty and noisy blasting as the primary extraction method, thereby protecting the surrounding environment, which has been designated as a
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Castle, where huge landslips made the stone more easily accessible, and the proximity of the sea allowed the quarried stone blocks to be moved over relatively large distances by barge.
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in which the trust is based, where a workshop is held every year. Tout Quarry has been donated to the Portland Sculpture and Quarry Trust by Portland Stone Firms Limited.
724:(stone coffins and matching lids, hewn from single large blocks of Portland stone) that have been unearthed locally over the years, testify to the skill of their makers. 1632: 882:
to resist the harsh industrial environment. Portland stone was mostly used in Manchester during the 1930s. Manchester buildings with Portland stone exterior include
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Portland stone has also been used across the world. Examples include the UN building in New York, the Casino Kursaal in Belgium and the
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in London's Whitehall. Erected in 1920, The Cenotaph commemorates the millions of people killed in this and subsequent conflicts. The
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Traditionally small diameter holes (35 mm) were drilled horizontally under each rock and charged with a small quantity of
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completed a detailed geological survey of Withies Croft Quarry before the Portland Beds were quarried by Albion Stone plc.
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Portland stone is recognised to be of a high quality, but is somewhat expensive. In the case of the refurbishment of the
943:, completed in 1929, is also built with Portland stone, as are the public buildings in Cardiff's civic centre. Architect 622:
is arduous work and so wire-saws have been introduced into the quarries, replacing much of the plug and feather cutting.
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buildings in London today use Portland which has been quarried using the same methods over the last 60 years.
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in London, which won the "New Build (Modern Non-Load-bearing Stone) Award" in the 2006 Natural Stone Awards.
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commemorates the 55,573 crew members of the RAF's Bomber Command who were killed between 1939 and 1945.
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and presenting a material which he hoped looked like the famous Portland building stone.
959:. The 1929 steel framed building (one of the first erected in the United Kingdom) of the 947:
significantly used the stone in his major commissions of the 1920s and 1930s, including
2628: 2454: 2225: 2149: 2103: 2043: 1439:"Firm to hack rare stone from Dorset's protected coastline with permit granted in 1951" 1352: 1121: 1096: 944: 935:, Keppel Street. Opened in 1929, the image shows the building's Portland stone facade . 903: 802: 798: 380: 178: 2782: 2674: 2658: 2330: 2271: 2179: 2119: 2063: 1385: 1196: 1143: 1104: 1062: 844: 744: 690: 604: 540: 526: 355: 335: 82: 47: 1522:
In: Ullmann's Encyclopedia of Industrial Chemistry. Fifth completely revised edition
797:(1753) with the new WCEC extension in Portland Roach which was short-listed for the 2366: 2311: 2210: 2129: 2053: 1910: 1155: 818: 728: 717: 517: 366:. Portland stone is also exported to many countries, being used for example at the 1124:'s central court, the planned Portland stone was controversially substituted with 1466: 2699: 2608: 2245: 2134: 1923: 1660: 952: 826: 770: 760: 630: 584: 456: 432: 57: 1088:
killed in the First and Second World Wars were made out of Portland stone. The
509: 2613: 1943: 1920: 1799: 1720: 1081: 1074: 871: 721: 686: 659: 619: 102: 67: 1568: 350:, England. The quarries are cut in beds of white-grey limestone separated by 2215: 1953: 1905: 1900: 1443: 1291: 879: 774: 705: 596: 513:
The tramway incline from the Admiralty Quarry seen from Castletown, Portland
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used Portland stone (quarried from the bottom of Wakeham) to construct the
17: 1610: 1228: 2653: 2038: 2033: 1580: 1471: 972: 964: 825:). Portland stone was used in 1923 to build the supporting pillar of the 610:
In 1999, Italian stone cutting equipment, originally designed for use in
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despite the historical preferred use of hard-wearing materials, such as
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and bicarbonate ions within the water are then able to combine, to form
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The earliest known building to be constructed using Portland stone is
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beds. It has been used extensively as a building stone throughout the
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stone from France, another similar (but cheaper) oolitic limestone.
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and London were reconstructed using vast facades of Portland stone.
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use Portland Limestone supplier Albion Stone's Portland Basebed.
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techniques. The reserves to the north will be quarried using the
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Stone Quarry Landscapes: The Industrial Archaeology of Quarrying
1151: 773:(1573โ€“1652) used Portland stone to build the Banqueting Hall in 416: 1987: 1614: 607:(called graining) than perpendicular to them (called cutting). 1036: 990:
Building, the Chemistry and Engineering buildings and the new
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Gerhartz, W., ed. (1986). "Cement and concrete: see p. 492".
1229:"Withies Croft Wall - Isle of Portland - Geology by Ian West" 1004:
has been refurbished using a large amount of Portland stone.
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has almost certainly been used as a building material since
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typically uses oolitic limestone in its buildings, and the
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Limestone quarried on the Isle of Portland, Dorset, England
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Recently, Portland stone has been used in the building of
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Dorset: Portland Chert Member, Portland Freestone Member
358:, notably in major public buildings in London such as 2755: 2739: 2713: 2667: 2601: 2580: 2509: 2473: 2442: 2416: 2375: 2349: 2259: 2188: 2112: 2021: 1853: 1753: 1648: 1386:"Building stone - National buildings and memorials" 921:, are clad in Portland stone which surrounds their 291: 280: 270: 265: 257: 247: 242: 228: 218: 213: 205: 195: 185: 176:: Tisbury Member, Wockley Member, Chilmark Member 167: 157: 147: 41: 1495:"The Great Portico Fiasco: A most inferior oolite" 1367:"London School of Hygiene & Tropical Medicine" 961:London School of Hygiene & Tropical Medicine 933:London School of Hygiene & Tropical Medicine 978:Many of the buildings surrounding the flagship 2251:Weymouth and Portland National Sailing Academy 1150:created by burning a mixture of limestone and 781:used nearly one million cubic feet to rebuild 1999: 1626: 1223: 1221: 1175: โ€“ Limestone deposits listed by location 821:is partly clad in Portland stone (along with 8: 1191: 1189: 805:(1792), the General Post Office (1829), the 793:buildings constructed of Portland stone are 387:) is released into the atmosphere as a gas. 1142:The term, "Portland cement", was coined by 2267:Admiralty Underwater Weapons Establishment 2006: 1992: 1984: 1633: 1619: 1611: 1047:International Union of Geological Sciences 1045:Portland stone has been designated by the 986:are clad in Portland stone, including the 129: 38: 1524:. Vol. A5. VCH Publisher, New York. 1035:(1818). More recent projects include the 497:Learn how and when to remove this message 1553:. Monkton Farleigh, Wilts: Folly Books. 1551:Stone to Build London: Portland's Legacy 785:and many other minor churches after the 1605:Mark Godden's feature in Geology Today 1437:de Bruxelles, Simon (12 January 2009). 1391:Te Ara: The Encyclopedia of New Zealand 1309:"Stone Carving & Sculpture Courses" 1185: 403:) accumulated forming lime mud (called 209:up to 38 metres (120 ft) in Dorset 1303: 1301: 646:Mining in Portland is done by using a 1154:, resembling the previously existing 735:Portland stone was used to build the 312:, London, is made from Portland stone 7: 767:(unveiled 1911) is also made of it. 479:adding citations to reliable sources 1467:"Queen unveils new forces memorial" 1417:IUGS Subcommission: Heritage Stones 1061:Following the First World War, Sir 759:, the official London residence of 720:times. The many well crafted Roman 535:Site of Special Scientific Interest 2789:Architecture in the United Kingdom 2302:Ministry of Defence Magnetic Range 1276:: Tempus Press. pp. 100โ€“109. 1090:Commonwealth War Graves Commission 25: 2527:Church of Our Lady and St. Andrew 2336:Verne Heavy Anti-Aircraft Battery 2221:King Barrow Quarry Nature Reserve 1146:who in 1824 patented a hydraulic 529:cutting machines, hydro bags and 2231:Perryfield Quarry Nature Reserve 2196:Broadcroft Quarry Nature Reserve 1744: 1577:Portland, an Illustrated History 455: 1384:Nathan, Simon; Hayward, Bruce. 1349:Liverpool: City of Architecture 1327:"Building Stones of Manchester" 1248:"The Mohs Stone Hardness Scale" 1201:BGS Lexicon of Named Rock Units 870:Portland stone is prevalent in 466:needs additional citations for 2403:Portland Breakwater Lighthouse 1051:Global Heritage Stone Resource 409:Mohs scale of mineral hardness 1: 2376:Lighthouses, daymarks and NCI 1601:Geology of the Jurassic Coast 634:Portland stone quarry on the 2668:Working and disused quarries 2113:Beaches and coastal features 1009:Auckland War Memorial Museum 743:in 1349 and the first stone 2460:Governor's Community Garden 1071:RAF Bomber Command Memorial 841:United Nations Headquarters 368:United Nations headquarters 2840: 2567:Underhill Methodist Church 2542:Southwell Methodist Chapel 2246:Tout Quarry Sculpture Park 2206:Culverwell Mesolithic Site 1197:"Portland Stone Formation" 1173:List of types of limestone 1135: 919:Port of Liverpool Building 896:Manchester Central Library 702:Port of Liverpool Building 29: 2824:Jurassic System of Europe 2522:Avalanche Memorial Church 1972: 1825:National Trust properties 1742: 1205:British Geological Survey 1168:List of decorative stones 857:University College London 855:, Wilkins Terrace at UCL 618:. 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2299: 2294: 2289: 2284: 2279: 2274: 2269: 2263: 2261: 2257: 2256: 2254: 2253: 2248: 2243: 2238: 2233: 2228: 2226:Nicodemus Knob 2223: 2218: 2213: 2208: 2203: 2198: 2192: 2190: 2186: 2185: 2183: 2182: 2177: 2172: 2167: 2162: 2157: 2152: 2150:Hallelujah Bay 2147: 2145:Freshwater Bay 2142: 2137: 2132: 2127: 2122: 2116: 2114: 2110: 2109: 2107: 2106: 2101: 2096: 2091: 2086: 2081: 2076: 2071: 2066: 2061: 2056: 2051: 2046: 2041: 2036: 2031: 2025: 2023: 2019: 2018: 2013: 2011: 2010: 2003: 1996: 1988: 1979: 1978: 1973: 1970: 1969: 1967: 1966: 1961: 1956: 1951: 1949:Portland stone 1946: 1941: 1936: 1931: 1926: 1918: 1913: 1908: 1903: 1898: 1893: 1888: 1883: 1878: 1873: 1868: 1863: 1857: 1855: 1851: 1850: 1848: 1847: 1842: 1837: 1832: 1827: 1822: 1817: 1812: 1807: 1802: 1797: 1792: 1787: 1782: 1777: 1772: 1767: 1761: 1759: 1751: 1750: 1743: 1741: 1739: 1738: 1733: 1728: 1723: 1718: 1713: 1708: 1703: 1698: 1693: 1688: 1683: 1678: 1673: 1671:English Gothic 1668: 1663: 1658: 1652: 1650: 1646: 1645: 1640: 1638: 1637: 1630: 1623: 1615: 1609: 1608: 1603: 1596: 1595:External links 1593: 1592: 1591: 1573: 1559: 1544: 1541: 1538: 1537: 1530: 1512: 1486: 1458: 1429: 1404: 1376: 1358: 1353:Bluecoat Press 1339: 1318: 1297: 1282: 1260: 1246:Knapper, Ian. 1238: 1217: 1184: 1183: 1181: 1178: 1177: 1176: 1170: 1163: 1160: 1136:Main article: 1133: 1130: 1122:British Museum 1117: 1114: 1058: 1055: 988:Michael Sadler 945:Charles Holden 904:Sunlight House 803:Somerset House 799:Stirling Prize 656: 653: 627: 624: 605:bedding planes 592: 589: 527:diamond bladed 505: 504: 463: 461: 454: 448: 445: 428: 427:History of use 425: 396: 384: 381:carbon dioxide 375: 372: 317:Portland stone 297: 296: 293: 289: 288: 282: 278: 277: 272: 268: 267: 263: 262: 261:United Kingdom 259: 255: 254: 249: 245: 244: 240: 239: 230: 226: 225: 220: 216: 215: 211: 210: 207: 203: 202: 197: 193: 192: 187: 183: 182: 179:Vale of Pewsey 169: 165: 164: 162:Portland Group 159: 155: 154: 149: 145: 144: 134: 126: 125: 118: 117: 116: 111: 106: 101: 96: 91: 86: 81: 76: 71: 66: 61: 56: 55: 44: 43: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2836: 2825: 2822: 2820: 2817: 2815: 2812: 2810: 2807: 2805: 2802: 2800: 2797: 2795: 2792: 2790: 2787: 2786: 2784: 2769: 2766: 2764: 2761: 2760: 2758: 2754: 2748: 2745: 2744: 2742: 2738: 2732: 2729: 2727: 2724: 2722: 2719: 2718: 2716: 2712: 2706: 2703: 2701: 2698: 2696: 2693: 2691: 2688: 2686: 2683: 2681: 2678: 2676: 2675:Bowers Quarry 2673: 2672: 2670: 2666: 2660: 2659:Verne Cistern 2657: 2655: 2652: 2650: 2647: 2645: 2642: 2640: 2637: 2635: 2632: 2630: 2627: 2625: 2622: 2620: 2617: 2615: 2612: 2610: 2607: 2606: 2604: 2600: 2594: 2591: 2589: 2586: 2585: 2583: 2579: 2573: 2570: 2568: 2565: 2563: 2560: 2558: 2555: 2553: 2550: 2548: 2545: 2543: 2540: 2538: 2535: 2533: 2530: 2528: 2525: 2523: 2520: 2518: 2515: 2514: 2512: 2508: 2502: 2499: 2497: 2494: 2492: 2489: 2487: 2484: 2482: 2479: 2478: 2476: 2472: 2466: 2463: 2461: 2458: 2456: 2453: 2451: 2448: 2447: 2445: 2441: 2435: 2432: 2430: 2427: 2425: 2422: 2421: 2419: 2415: 2409: 2406: 2404: 2401: 2399: 2396: 2394: 2391: 2389: 2386: 2384: 2381: 2380: 2378: 2374: 2368: 2365: 2363: 2360: 2358: 2355: 2354: 2352: 2348: 2342: 2339: 2337: 2334: 2332: 2331:Verne Citadel 2329: 2327: 2324: 2322: 2320: 2315: 2313: 2310: 2308: 2305: 2303: 2300: 2298: 2295: 2293: 2290: 2288: 2285: 2283: 2280: 2278: 2275: 2273: 2272:Blacknor Fort 2270: 2268: 2265: 2264: 2262: 2258: 2252: 2249: 2247: 2244: 2242: 2239: 2237: 2234: 2232: 2229: 2227: 2224: 2222: 2219: 2217: 2214: 2212: 2209: 2207: 2204: 2202: 2199: 2197: 2194: 2193: 2191: 2187: 2181: 2180:Wallsend Cove 2178: 2176: 2173: 2171: 2168: 2166: 2163: 2161: 2158: 2156: 2153: 2151: 2148: 2146: 2143: 2141: 2138: 2136: 2133: 2131: 2128: 2126: 2123: 2121: 2120:Balaclava Bay 2118: 2117: 2115: 2111: 2105: 2102: 2100: 2097: 2095: 2092: 2090: 2087: 2085: 2082: 2080: 2077: 2075: 2072: 2070: 2067: 2065: 2064:Portland Bill 2062: 2060: 2057: 2055: 2052: 2050: 2047: 2045: 2042: 2040: 2037: 2035: 2032: 2030: 2027: 2026: 2024: 2020: 2016: 2009: 2004: 2002: 1997: 1995: 1990: 1989: 1986: 1976: 1971: 1965: 1964:Cruck framing 1962: 1960: 1957: 1955: 1952: 1950: 1947: 1945: 1942: 1940: 1937: 1935: 1932: 1930: 1927: 1925: 1922: 1919: 1917: 1916:Country house 1914: 1912: 1909: 1907: 1904: 1902: 1899: 1897: 1894: 1892: 1889: 1887: 1884: 1882: 1879: 1877: 1874: 1872: 1869: 1867: 1864: 1862: 1859: 1858: 1856: 1852: 1846: 1843: 1841: 1838: 1836: 1835:Hindu temples 1833: 1831: 1828: 1826: 1823: 1821: 1818: 1816: 1813: 1811: 1808: 1806: 1803: 1801: 1798: 1796: 1793: 1791: 1788: 1786: 1783: 1781: 1778: 1776: 1773: 1771: 1768: 1766: 1763: 1762: 1760: 1758: 1755:Buildings and 1752: 1747: 1737: 1734: 1732: 1729: 1727: 1724: 1722: 1719: 1717: 1714: 1712: 1709: 1707: 1704: 1702: 1699: 1697: 1694: 1692: 1689: 1687: 1684: 1682: 1679: 1677: 1674: 1672: 1669: 1667: 1664: 1662: 1659: 1657: 1654: 1653: 1651: 1647: 1643: 1636: 1631: 1629: 1624: 1622: 1617: 1616: 1613: 1607: 1604: 1602: 1599: 1598: 1594: 1590: 1586: 1582: 1578: 1574: 1570: 1566: 1562: 1556: 1552: 1547: 1546: 1542: 1533: 1531:0-89573-155-X 1527: 1523: 1516: 1513: 1500: 1496: 1490: 1487: 1474: 1473: 1468: 1462: 1459: 1446: 1445: 1440: 1433: 1430: 1418: 1414: 1408: 1405: 1393: 1392: 1387: 1380: 1377: 1372: 1368: 1362: 1359: 1354: 1350: 1343: 1340: 1328: 1322: 1319: 1314: 1310: 1304: 1302: 1298: 1293: 1289: 1285: 1279: 1275: 1271: 1264: 1261: 1249: 1242: 1239: 1234: 1230: 1224: 1222: 1218: 1206: 1202: 1198: 1192: 1190: 1186: 1179: 1174: 1171: 1169: 1166: 1165: 1161: 1159: 1157: 1153: 1149: 1145: 1144:Joseph Aspdin 1139: 1131: 1129: 1127: 1123: 1115: 1113: 1110: 1109:Liam O'Connor 1106: 1105:Staffordshire 1102: 1098: 1093: 1091: 1087: 1083: 1078: 1076: 1072: 1068: 1064: 1063:Edwin Lutyens 1056: 1054: 1052: 1048: 1043: 1041: 1038: 1034: 1030: 1026: 1022: 1018: 1014: 1010: 1005: 1003: 999: 995: 993: 989: 985: 981: 976: 974: 970: 966: 962: 958: 954: 950: 946: 942: 934: 930: 926: 924: 920: 916: 912: 907: 905: 901: 897: 893: 889: 885: 881: 877: 873: 868: 866: 862: 858: 854: 847:, built 1952. 846: 845:New York City 842: 838: 834: 832: 828: 824: 820: 816: 812: 811:Mansion House 808: 804: 800: 796: 790: 788: 784: 780: 777:in 1620. Sir 776: 772: 768: 766: 762: 758: 754: 750: 746: 745:London Bridge 742: 739:in 1347, the 738: 733: 730: 725: 723: 719: 715: 708:, built 1907. 707: 703: 699: 693:, built 1935. 692: 691:Edwin Lutyens 688: 684: 680: 674:, built 1677. 673: 669: 665: 661: 654: 652: 649: 641: 637: 632: 625: 623: 621: 617: 613: 608: 606: 602: 598: 590: 588: 586: 580: 576: 573: 569: 566: 562: 560: 556: 552: 549: 545: 542: 541:Bowers Quarry 538: 536: 532: 528: 523: 519: 511: 501: 498: 490: 480: 476: 470: 469: 464:This section 462: 458: 453: 452: 446: 444: 442: 438: 434: 426: 424: 422: 418: 412: 410: 406: 402: 394: 390: 382: 373: 371: 369: 365: 361: 357: 356:British Isles 353: 349: 345: 341: 337: 336:Late Jurassic 333: 329: 325: 322: 318: 311: 307: 303: 294: 290: 286: 283: 279: 276: 273: 269: 264: 260: 256: 253: 250: 246: 241: 238: 234: 231: 227: 224: 221: 217: 212: 208: 204: 201: 198: 194: 191: 188: 184: 180: 177: 175: 170: 166: 163: 160: 156: 153: 150: 146: 142: 138: 132: 127: 114: 109: 104: 99: 94: 89: 84: 79: 74: 69: 64: 59: 49: 45: 40: 37: 33: 19: 2633: 2367:Rufus Castle 2318: 2312:RAF Portland 2155:Little Beach 2130:Chesil Beach 2054:Fortuneswell 2049:Ferry Bridge 1948: 1911:Bastle house 1790:Roman villas 1576: 1550: 1521: 1515: 1503:. Retrieved 1498: 1489: 1477:. Retrieved 1470: 1461: 1449:. Retrieved 1442: 1432: 1420:. Retrieved 1416: 1407: 1395:. Retrieved 1389: 1379: 1371:the original 1361: 1348: 1342: 1332:30 September 1330:. Retrieved 1321: 1312: 1269: 1263: 1251:. Retrieved 1241: 1232: 1208:. Retrieved 1200: 1156:Roman cement 1141: 1119: 1116:Substitution 1094: 1079: 1073:in London's 1060: 1044: 1027:(1791), the 1019:(1779), the 1006: 996: 977: 949:Senate House 938: 911:Three Graces 910: 908: 900:Kendal Milne 869: 850: 819:Tower Bridge 791: 769: 734: 729:Rufus Castle 726: 711: 645: 609: 594: 581: 577: 570: 563: 557: 553: 546: 539: 516: 493: 484: 473:Please help 468:verification 465: 430: 413: 377: 327: 316: 315: 306:The Cenotaph 266:Type section 172: 36: 2700:Tout Quarry 2629:King's Pier 2609:Durdle Pier 2189:Attractions 2170:Pulpit Rock 2160:Mutton Cove 2135:Chesil Cove 1845:Lighthouses 1800:Hall houses 1681:Elizabethan 1661:Saxo-Norman 1656:Anglo-Saxon 1422:24 February 1397:14 December 1082:gravestones 953:55 Broadway 902:(1939) and 876:Burmantofts 827:Grace Gates 771:Inigo Jones 712:Portland's 585:Tout Quarry 433:Inigo Jones 334:age of the 18:Roach Stone 2783:Categories 2614:Folly Pier 2292:HMS Osprey 2099:West Cliff 2029:Castletown 1944:Bath stone 1921:Oast house 1876:Manchester 1866:Birmingham 1757:structures 1721:Jacobethan 1701:Queen Anne 1583:, Dorset: 1180:References 1075:Green Park 872:Manchester 722:sarcophagi 687:Manchester 2799:Limestone 2644:Red Crane 2581:Memorials 2216:Jurassica 2175:Salt Pans 2125:Cave Hole 2084:Underhill 2074:Southwell 2059:The Grove 1954:Flushwork 1906:Almshouse 1901:Fan vault 1871:Liverpool 1830:Windmills 1736:Brutalist 1726:Edwardian 1716:Victorian 1569:910854593 1444:The Times 1095:Portland 1057:Memorials 1017:City Hall 994:Library. 880:sandstone 801:in 2017, 789:in 1666. 775:Whitehall 747:in 1350. 714:freestone 706:Liverpool 597:gunpowder 531:wire saws 487:June 2010 332:Tithonian 321:limestone 310:Whitehall 295:25 metres 271:Named for 237:Sandstone 233:Siltstone 223:Limestone 214:Lithology 206:Thickness 186:Underlies 168:Sub-units 53:Tithonian 2654:Sureline 2602:Industry 2510:Churches 2260:Military 2039:Clay Ope 2034:Chiswell 1975:Category 1840:Stadiums 1706:Georgian 1691:Carolean 1686:Jacobean 1581:Wimborne 1472:BBC News 1447:. London 1292:47830911 1162:See also 1067:Cenotaph 1023:(1767), 973:Coventry 965:Plymouth 925:frames. 917:and the 906:(1932). 898:(1934), 894:(1912), 890:(1937), 886:(1935), 813:and the 340:quarried 338:that is 285:Clay Ope 281:Location 243:Location 196:Overlies 2714:Railway 2443:Gardens 2417:Prisons 2350:Castles 2094:Wakeham 2079:Tophill 1886:Bristol 1815:Museums 1765:Castles 1505:25 July 1451:27 June 1253:17 June 1210:25 July 992:Laidlaw 982:at the 969:Bristol 616:loaders 612:Tuscany 518:Jordans 405:micrite 401:calcite 389:Calcium 374:Geology 342:on the 258:Country 252:England 219:Primary 158:Unit of 139:on the 119:↓ 2756:Events 2740:Sports 2319:Osprey 2104:Weston 2044:Easton 1924:(cowl) 1861:London 1666:Norman 1649:Styles 1587:  1567:  1557:  1528:  1501:. 2012 1479:22 May 1290:  1280:  1274:Stroud 1148:binder 1132:Cement 1013:Dublin 998:Oxford 913:, the 809:, the 668:London 640:Dorset 626:Mining 348:Dorset 248:Region 137:quarry 1854:Other 1676:Tudor 1097:stone 1049:as a 718:Roman 417:ooids 395:(CaCO 352:chert 319:is a 308:, in 229:Other 1881:Bath 1585:ISBN 1565:OCLC 1555:ISBN 1526:ISBN 1507:2019 1481:2010 1453:2010 1424:2019 1399:2015 1334:2012 1288:OCLC 1278:ISBN 1255:2019 1212:2019 1152:clay 1084:for 1080:The 951:and 939:The 878:and 863:and 751:and 441:Wren 362:and 148:Type 58:Pre๊ž’ 1103:in 1037:BBC 829:at 689:by 670:by 477:by 383:(CO 346:in 2785:: 1563:. 1497:. 1469:. 1441:. 1415:. 1388:. 1351:. 1311:. 1300:^ 1286:. 1272:. 1231:. 1220:^ 1203:. 1199:. 1188:^ 1053:. 971:, 967:, 867:. 843:, 833:. 817:. 704:, 685:, 666:, 638:, 439:. 435:' 411:. 235:, 108:Pg 50:: 2321:) 2007:e 2000:t 1993:v 1634:e 1627:t 1620:v 1571:. 1534:. 1509:. 1483:. 1455:. 1426:. 1401:. 1355:. 1336:. 1315:. 1294:. 1257:. 1235:. 1214:. 642:. 500:) 494:( 489:) 485:( 471:. 397:3 385:2 113:N 103:K 98:J 93:T 88:P 83:C 78:D 73:S 68:O 63:๊ž’ 34:. 20:)

Index

Roach Stone
Portland brownstone
Stratigraphic range
Pre๊ž’
๊ž’
O
S
D
C
P
T
J
K
Pg
N

quarry
Isle of Portland
Geological formation
Portland Group
Vale of Wardour
Vale of Pewsey
Lulworth Formation
Portland Sand Formation
Limestone
Siltstone
Sandstone
England
Isle of Portland
Clay Ope

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