Location:

Ambridge, PA: Twin road cuts
Coal Forest and marine environment

~ 299 - 300 Million Years Old
Upper Pennsylvanian, Westphalian D to Stephanian A
Conemaugh Group: Mahoning Formation and Brush Creek Marine Zone

Gastropods are abundant at the marine zone. They are mostly found 6 - 12" below a noticable pebble layer in the cliff.