Object of the Month: 08/2000

What is it?:

Phareodus fish fossil


Green River Formation of Wyoming

Age: Eocene (55.8 - 33.9 Million years ago)

6 1/2 inches (15 1/4 centimeters) long

Accession #: P78.9.36

Phareodus fish fossil
Phareodus fish fossil

This is a 50-million-year-old fish (Phareodus) from the Green River Formation of Wyoming. This fossil is testament to a time when giant lakes covered large parts of Wyoming, Utah, and Colorado. The Science Museum of Minnesota's Paleontology Department has over 100 fossils of Green River fish, including some type specimens (specimens on which new species are based).