Undetermined Pelecypod

Undetermined name for a very large pelecypod ,usually pelecypods in the Arkona shale are very small .There is Hederella sp on it as well . This info was found on the Friends of the UMMP Michigan Basin Specimen Database ,but this is in my collection .

Size is 7.4 cm at widest part

Arkona shale

Hungry Hollow

Middle Devonian

Arkona ,Ontario