Smithsonian Institution
National Museum of Natural History: Paleobiology: Green River Fossil Collections
Search the collection of 35,000 fossiliferous rocks found within the Green River Formation of Colorado and Utah. View some of these 50 million year old insect fossils in a linked slide show.
Smithsonian Institution
National Museum of Natural History: Paleobiology: Green River Insects
Interactive photo search of the collection of 35,000 fossiliferous rocks found within the Green River Formation of Colorado and Utah.
San Diego Natural History Museum
San Diego Natural History Museum: Fossil Field Guide: Crassatellid Clam
A look at what fossil evidence reveals about the life and ecological interactions of this extinct species of a clam.