The colonial coral fossil Favosites pirum? found in the Jeffersonville Limestone of Jefferson County, Kentucky.  This almost spherical co...

Heliophyllum agassizi? horn coral fossil found in Jeffersonville Limestone from Jefferson County, Kentucky. Coral grew in the Middle Dev...

Here are two cancelled U.S. postage stamps from 1989 depicting the flying reptile Pteranodon .  This stamp was part of four set with the ...