All fossils in the Ordovician

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		Quaternary
		Tertiary
		Cretaceous
		Jurassic
		Triassic
		Permian
		Carboniferous
		Devonian
		Silurian
		Ordovician
		Cambrian
		Precambrian

Eotomaria © 2003 Milwaukee Public Museum	Salpinogostoma and Calymene callicephala © 1998 Dr. Richard Paselk, Humboldt State University Natural History Museum	Receptaculites © 2003 P.J. Noble, University of Nevada, Reno
Graptolites © 2003 Otto S. Zapecza	Orthograptus © 2003 Thomas Kammer	Amecystis laevis © 2006 Joe Koniecki
Cheirocrinus cf. forbesi © 2004 UCMP	Cryptogoleus chapmani © 2006 Joe Koniecki	Cytaster © 2001 Richard Schrantz

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