Search results
Results from the WOW.Com Content Network
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.
In the past quarrying for aggregate was undertaken below the dimension stone beds down to the Portland clay, where Broadcroft was the only area on Portland where the full stratigraphical column could be viewed. [3] Planning consent for modern day quarrying on Portland was granted in 1951, covering 324 hectares of the island.
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).
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]
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 ...
Geological map of Dorset Stratigraphic column. Dorset / ˈ d ɔːr s ɪ t / (or archaically, Dorsetshire) is a county in South West England on the English Channel coast. Covering an area of 2,653 square kilometres (1,024 sq mi); it borders Devon to the west, Somerset to the north-west, Wiltshire to the north-east, and Hampshire to the east.