All fossils in the Devonian

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		Quaternary
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		Cretaceous
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		Triassic
		Permian
		Carboniferous
		Devonian
		Silurian
		Ordovician
		Cambrian
		Precambrian

Favosites © 2003 P.J. Noble, University of Nevada, Reno	Favosites © 2005 Geb Bennett, Shenandoah Valley Discovery Museum	Favosites turbinatus © 2006 Joe Koniecki
Heliophyllum verticale (Hall) © 2006 Falls of the Ohio State Park	Hexagonaria © 1998 Dr. Richard Paselk, Humboldt State University Natural History Museum	Hexagonaria © 2004 Michigan State University Museum
Hexagonaria percarinata © 1998 Dr. Richard Paselk, Humboldt State University Natural History Museum	Prismatophyllum © 2004 Indiana State Museum, Indiana Geological Survey, and Indiana University	Prismatophyllum ovoideum (Davis) © 2006 Falls of the Ohio State Park

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