Clam Fossils (49-37 Million Years Old) (IMAGE) National Evolutionary Synthesis Center (NESCent) Caption Location: Claiborne Bluff on the Alabama River, Monroe County, Alabama Organisms: Venericardia densata, extinct species of clam Age: middle Eocene (48.6 - 37.2 million years ago) Lisbon Formation Credit Photo by Paul Harnik Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.