Favosites coral found in Louisville, Kentucky also known as honeycomb coral.  Found with Silurian Period fossils but this could be a Devon...

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

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