Middle Ordovician Lehman Formation (Pogonip Group)

White Pine County, Nevada

The black pea to bean-shaped specimens embedded in the limestone are genus Leperditia ostracods, an unusually large variety of the invariably diminutive (often no wider than a millimeter--3/64 of an inch) bivalve crustaceans, from the late middle Ordovician Lehman Formation (youngest member of the Pogonip Group), White Pine County, Nevada.

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