Alabama is well known as a home to billions and billions of Cretaceous fossil oysters. People come from the other side of the world to examine them. Here is just one example.
Agerostrea falcata, a small oyster that is found almost anywhere Cretaceous fossil oysters are found in the state of Alabama. Like many oysters, this one has a very labile shell shape, controlled by the situation in which it grows.
This is a death assemblage of A. falcata, from the Bluffport Marl. This heap of oysters is interpreted to have grown on a sea fan, which was not preserved. These little piles of shells are found in many places on the outcrop where this one was discovered.
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