Here is a Heliophyllum horn coral that has bryozoan colony on it called Favosites clausus. It was found in Clark County, Indiana and existed...

Here are a number Cryptolithus bellus trilobite lace collars from the Ordovician period. It is in the Kope Formation or Eden Formation foun...

Here is a chain coral from the Silurian Period called Halysites . It appears to be about 8 cm long. It was found in northern Nashville, Ten...