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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 ...
Water came from the nearby Culver Well, and the chert for the stone artefacts came from exposures in the cliffs. The edge of the sea was about 300–400 metres further out than it is presently. [ 5 ] In November 1999, Archaeopress published the book Culverwell Mesolithic Habitation Site: Excavation Report and Research Studies , written by ...
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 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.
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 is a 30-feet pillar of Portland stone, left as a landmark and quarrying relic at East Cliff on the Isle of Portland, Dorset, England. A similar artificial pillar formed through quarrying is Pulpit Rock at Portland Bill. [1]
On 13 November 2011, Portland Stone Firms Ltd held a Track 'n' Trail Enduro Event in the working part of the quarry. It was the first event of its kind and attracted many enthusiasts around the UK, many of which whom rated the contest as one of the toughest and most enjoyable in the UK afterwards.
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 ...