
The Carboniferous Limestone is a collective term for the succession of limestones occurring widely throughout Great Britain and Ireland that were deposited during the Dinantian Epoch of the Carboniferous Period. These rocks formed between 363 and 325 million years ago. Within England and Wales, the entire limestone succession, which includes subor...
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http://en.wikipedia.org/wiki/Carboniferous_Limestone

This is a descriptive term to denote the age of the limestone.
Found on
http://www.encyclo.co.uk/visitor-contributions.php
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