Here is a chain coral from the Silurian Period called Halysites . It appears to be about 8 cm long. It was found in northern Nashville, Ten...

Here is a fragment of the Devonian Period horn coral called Siphonophrentis elongata  (Rafenesque & Clifford, 1820). This image gives a ...

An eroded crinoid stem from Lake Cumberland, Kentucky. The image contains a variety of different views. This crinoid was from the Mississipp...