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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 ...
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.
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 ...
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 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.
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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]
Portland stone was the most prestigious building stone in use in England at the time. The patent clearly does not describe the product recognised as Portland cement today. The product was aimed at the market for stuccos and architectural pre-cast mouldings, for which a fast-setting, low-strength cement was required (see cement).