UnknownFrom the Precambrian in California
©
2004 UCMP
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RusophycusFrom the Silurian in Kentucky
©
2001 Richard Schrantz
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ArthrophycusFrom the Silurian in West Virginia
©
2003 Thomas Kammer
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SkolithosFrom the Cambrian in West Virginia
©
2003 Thomas Kammer
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OldhamiaFrom the Cambrian in Alaska
©
2003 Roland Gangloff, University of Alaska Museum
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OphiomorphaFrom the Tertiary in New Jersey
©
2003 Otto S. Zapecza
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PlanolitesFrom the Triassic in New Jersey
©
2003 Otto S. Zapecza
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RusophycusFrom the Silurian in New Jersey
©
2003 Otto S. Zapecza
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ZoophycosFrom the Devonian in New York
©
2003 Jane Picconi
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