Heliophyllum horn coral found in the Middle Devonian aged Jeffersonville Limestone of Clark County, Indiana. Not sure what species this ...

I believe this fossil would be classified as a colonial coral or maybe a cluster of horn corals attached together. The Stumm book on Devon...

This Brevispirifer gregarius (Clapp, 1857) is almost a textbook example of a fossil specimen. Included with this posts ar...