Green River Formation
- From the U.C. Museum of Paleontology
- http://www.ucmp.berkeley.edu/tertiary/eoc/greenriver.html

Eocene Fossils
- These specimens are adjunct to a larger collection (15,500 pieces of rock on which are contained perhaps as many as 65,000 individual specimens), donated to and housed at the USNM-Smithsonian Institution, Washington, D.C.
- http://www.coloradomtn.edu/campus_rfl/staff_rfl/kohls/eocene.html

Fossil Butte National Monument
- This 50-million year old lake bed is one of the richest fossil localities in the world.
- http://www.nps.gov/fobu/