Petrocrania scabiosa

Inarticulate
Order Neotremata
Superclass Craniacea
Late Ordovician -Cincinnatian

Found throughout the Cincinnatian but more abundant in the Richmondian. Ovals, sometimes with concentric rings on valve. The valves are so thin that often they will show the underlying ornamentation of the object to which it is attached. Most often found on Rafinesquina valves.

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Descriptions courtesy of John Tate
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