Ancient Earth Trading Co. - (866) 327-8401

3.6 in Knightia alta Fossil Fish Green River - Wyoming

More Views

3.6 in Knightia alta Fossil Fish Green River - Wyoming

Availability: In stock

Knightia alta (Leidy, 1873)

Green River Formation - 50 Million years old
Kemmerer, Wyoming, USA

Knightia : 3.67 in.
Matrix : 10.1 x 8.1 in.
(1 inch = 2.54 cm)

A well preserved Knightia (Herring/Sardine) with a nice rich burgundy and black color and scales with amazing detail that contrast nicely against the matrix. This fish is from the famous 18 Inch Layer of the Green River Formation!

This specimen was collected by me in the late fall of 2016 and prepared March 2019.



The Green River Formation in Wyoming is one of the most famous and important Eocene (50-45 million years old) sites in the world. It provides a glimpse of the daily life surrounding the great Fossil Lake. From the prolific fossil fish deposits, the Green River Formation is also famous for it's insect, mammal, and even plant fossils! The formation exposes itself from southern Wyoming and into Utah and Colorado and shows us how life was more temperate at that time, often 60-70 degrees Fahrenheit. An exciting and dramatic difference to the climate in modern day Wyoming.