Hexagonaria Coral

This nice fossil find is from the Jeffersonville Limestone of Louisville, Kentucky.  It is a Hexagonaria coral that existed in the Middle Devonian Period. For more information, see Erwin Stumm's Silurian and Devonian Corals of the Falls of the Ohio pages 43-44 and plates 38-39 (pages 128-131).  The last picture is another fragment I found.