Palaeoneilo emarginata pelecypod from the Moscow formation

One of the easier pelecypods to ID from the middle Devonian is Palaeoneilo emarginata. It is an oval shaped shell with wide growth rings. The specimen below comes from the Windom shale member of the Moscow Formation at the Deep Springs Rd. borrow pit.

Compare this specimen to one from the Mahantango formation,  or from elsewhere in the Moscow formation.

This specimen was found at a borrow pit on Deep Springs Road in Madison County, NY which exposes the Windom shale member of the Moscow formation (middle Devonian in age, Givetian stage.)