This species of oyster is easy to identify because of the projection off the anterior end of the valve. The photo above is a left valve, anterior is to the left in the photo, and the large hump on the upper part of that side is the broken remnant of that projection. It was probably about twice as long before being broken.
C. sellaeformis is an excellent guide fossil to the upper Claibornian (Bartonian) of the middle Eocene in the southeastern Coastal Plains, being distributed from Texas to the Carolinas. The specimen pictured is from the Lisbon Formation on the Flint River between Americus and Vienna.
The species lived at the sediment surface, as oysters always do.
AGE: MIDDLE EOCENE
FORMATION: LISBON FORMATION
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