Fossilized Mercenaria Clam
A nice intact cast (organism not shell) clam fossil showing the hinge a partial rear foot. This species would have gained food by filtering the water. This organism would have lived in the Oligocene Epoch (Tertiary Period) making it 26 million to 38 million years old. This species was just prior to whales, dolphins and purpose. Found at Monroe Bay, Westmoreland County, Virginia along the Potomac River. Measurement is 3 ¾ inches long by 3 inches wide by 2 inches thick.