The index fossil of the Silurian period: Halysites . These coral fragments were found in the Louisville limestone in Jefferson County, Kent...

This series of pictures are of a Devonian period horn coral called Craterophyllum magnificum (Billings). I have been looking for one of...

Here is a large coral piece found in the Louisville Limestone in Jefferson County, Kentucky. It was from the Middle Silurian period. This ...