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The Cenotaph, in Whitehall, London, is made from Portland stone. Portland stone is a limestone geological formation (formally named the Portland Stone Formation [1]) dating to the Tithonian age of the Late Jurassic that is quarried on the Isle of Portland in Dorset, England. [1] The quarries are cut in beds of white-grey limestone separated by ...
Portland Ledge is an underwater extension of Portland Stone into the English Channel at a place where the depth of Channel is 20 to 40 metres (about 10 to 20 fathoms). Tidal flow is disrupted by the feature; at 10 metres (about 5 fathoms) deep and 2.4 kilometres (1.3 nmi) long, it causes a tidal race to the south of Portland Bill, the so-called ...
The Portland Stone Formation is further divided into a lower Portland Chert Member and an upper Portland Freestone Member, both of which are limestones. The Portland Sand Formation is made up largely of dolomites but includes siltstones and fine-grained sandstones in its lower parts.
[2] [3] The site is maintained by the Association for Portland Archaeology – a small group dedicated to researching, investigating and excavating on Portland. [ 4 ] Open days have been held on the site, where guided tours take place of the preserved site, showing and explaining the visible remains and artefacts and how Mesolithic people lived ...
The Trinity House Obelisk, also known as the Trinity House Landmark, is a 19th-century obelisk located at Portland Bill, on the Isle of Portland, Dorset, England. Built as a daymark, it has been Grade II Listed since 1978. [1] The obelisk was built in 1844 to warn ships off the coast of Portland Bill.
Nicodemus Knob was left as a pillar within the former Admiralty Quarries, which provided stone for the breakwaters of Portland Harbour between 1849-72. It marks the extent to which the convicts excavated stone from the quarries; some six million tonnes of stone was taken from the area, using convict labour from the nearby Portland Convict ...
The quarry is operated by Albion Stone and became the site of the first Portland Stone mine. In October 2002 the firm successfully initiated Portland's first ever underground mining operation, which was a precursor to Jordans Mine, which would start in 2008. [1] It has also been the selected site for the planned Mass Extinction Memorial ...
The Portland Sand Formation is a limestone formation from the Tithonian stage of the Jurassic period on the Isle of Portland, Dorset, England. [1] The formation is made up largely of dolomites but includes siltstones and fine-grained sandstones in its lower parts. [2] It is a sub unit of the Portland Group. [3]