Data: I need to identify this fossil

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Discussions:

• I am positive this is a fossil oyster; however, which specieis I am not certain ...AvrilB

• There are various oysters similar to 9, but the dark greenish appearance of the matrix suggests Ostrea sinuosa Rogers and Rogers, 1837, a common fossil in the general vicinity of the Potomac River downstream of Washington, DC. Where was it found? ... Dr. david C.