Hirnant Limestone
Hirnant Limestone
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Hirnant Limestone

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Hirnant Limestone

The Hirnant Limestone is an old name for a geologic formation in England and Wales, defining the Hirnantian. It preserves fossils dating back to the Ordovician period. It is now classified as the Hirnant Limestone Member of the Foel Y Ddinas Mudstones Formation.

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