Category:Ordovician metamorphic rocks in Pennsylvania

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Precambrian	Phanerozoic metamorphic rocks in Pennsylvania
Preceded by Proterozoic Eon	Phanerozoic metamorphic rocks in Pennsylvania
	Paleozoic Era						Mesozoic Era			Cenozoic Era
	Cambrian	Ordovician	Silurian	Devonian	Carboniferous	Permian	Triassic	Jurassic	Cretaceous	Paleogene	Neogene	4ry

Subcategories

This category has only the following subcategory.

M

Martinsburg Formation (5 C, 6 F)

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