Fossil fish most likely from the Green River Formation in Wyoming, dating back to the Eocene period. This ancient fish fossil from the United States is a rare find and showcases intricate details, making it a valuable collectible for enthusiasts of rocks, fossils, and minerals. The high level of preservation in this piece offers a glimpse into the past and a unique addition to any collection of vertebrate fossils.

Measures approximately 2.5” x 0.5” x 4.5”

Weighs 5 oz

Species: Most likely Diplomystus dentatus.

Origin: These fossils typically originate from Fossil Lake near Kemmerer, Wyoming.

Age: These date back to the Eocene Epoch, approximately 50 million years ago.

Identification: Diplomystus is distinguished from the more common Knightia by its distinctive upturned jaw and a much longer anal fin that begins where the dorsal fin ends. It was a predatory fish that fed in surface waters.

Chipped lower right side of the rock but not of the fossil