The Old Red Sandstone is a British lithostratigraphic unit (a sequence of rock strata) to which stratigraphers accord supergroup status and which is of considerable importance to early paleontology. For convenience the short version of the term, ORS is often used in literature on the subject. The term was coined to distinguish the sequence from the younger New Red Sandstone which also occurs widely throughout Britain.
Read more about Old Red Sandstone: Sedimentology, Stratigraphy, History of Study, Use As A Building Stone
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