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Category:Ordovician rocks in Ohio

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

Subcategories

This category has the following 5 subcategories, out of 5 total.

*

Ordovician sedimentary rocks in Ohio (18 C, 1 F)
Ordovician sediments in Ohio (1 C)

B

Black River Group (geology) (6 C, 3 F)

M

Millbrig Bentonite (4 F)

O

Ordovician formations in Ohio (30 C)

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