Found in Louisville, Kentucky in Louisville Limestone. Appears to be the Silurian coral, Cystihalysites nexus .

This coral came out of an area of Devonian corals in Jefferson County, Kentucky. I think it might be some sort of Heliophyllum . The outsi...

Here is a Devonian coral called Hexagonaria cincta found in Jeffersonville Limestone in Jefferson County, Kentucky (Louisville).