Horn Coral: Aulacophyllum

Aulacophyllum horn coral found in the Jeffersonville Limestone of Clark County, Indiana. The coral existed in the Devonian Period.

St. Clair Pennsylvania Fern Fossils

Pictures of fern fossils from St. Clair, Pennsylvania. These plants grew in the Late Carboniferous or Pennsylvanian Period and can be found in the Llewellyn Formation.  Fossils compliments of Shamalama.

St. Clair is famous for the white appearance of their plant fossils which caused by aluminum silicate or pyrophyllite. This first fossil is Alethopteris.

Modern fern image to use as comparison to fossil.

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.