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Coral rag is a rubbly limestone composed of ancient coral reef material. The term also refers to the building blocks quarried from these strata, which are an important local building material in areas such as the coast of East Africa and the southeastern United States littoral (e.g. Florida, Bermuda).
It is also the name of a member—the Coral Rag Member—of the Upper Oxfordian Coralline Oolite FormationofNorth Yorkshire.[1] "Calne Freestone And Coral Rag" is a former name for the Stanford Formation, which stretches from WestburyinWiltshiretoWaddesdoninBuckinghamshire.[2]
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