File:Frosterley Marble (Great Limestone, Mississippian; Rogerley Quarry, England) (14805050675).jpg

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"Frosterley Marble" from the Mississippian of Britain. (field of view 12.5 cm across)

In the commercial decorative stone trade, “marble” is used to refer to a wide variety of relatively soft rocks (H = 3 to 5) that will take a fine polish. These include true marbles and rocks that aren’t marbles, such as limestones, tectonic breccias, and serpentinites. True limestones are calcitic biogenic and ~chemical sedimentary rocks.

"Frosterley Marble" is a fossiliferous limestone from Rogerley Quarry at Frosterley, Durham County, northern England. The large, light gray-brown colored, rounded objects in the rock are fossil rugose corals (“horn corals”) - Dibunophyllum bipartitum (M’Coy, 1849) (Animalia, Cnidaria, Anthozoa, Rugosa, Streptelasmatina, Zaphrenticae, Aulophyllidae). This coral species is commonly encountered in the Great Limestone, a lower Upper Mississippian unit (upper Visean Stage/upper Asbian Stage, Lower Carboniferous, ~329-330 million years) in northern England.
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Source Frosterley Marble (Great Limestone, Mississippian; Rogerley Quarry, England)
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/14805050675 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

7 December 2019

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current17:56, 7 December 2019Thumbnail for version as of 17:56, 7 December 20192,442 × 2,244 (1.72 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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