This bivalve fossil was found in Monroeville, Monroe County, Alabama in the Gosport Sand Formation. It existed in the Eocene Epoch of the Paleogene Period. The fossil appears to be a Venericardia alticosta (Conrad 1833). I think I have had this fossil since 2010 but just recently cleaned it and found its name. Thanks to Herb & Pam for the fossil.
Identification based on plate 167 figure 16 of Index Fossils of North America (Shimer & Shrock, 1944).
