Type - Priscacara Fish
Period - Eocene
37 to 53 million years ago
Location - Wyoming, North America
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The Green River Formation, located in southwestern Wyoming, is made up of ancient lake beds that once formed a lush, subtropical environment. These calm, mineral-rich waters were the perfect conditions for fossilization.
 
When fish died, they sank to the bottom of the lake where oxygen levels were low and sediment quickly covered their bodies, helping preserve even the most delicate features like scales, fins and bones!
 
Unlike many fossil sites where you’re lucky to find a single bone or partial imprint, here you regularly find complete fossils that look as if the fish died only yesterday.
 
This specimen Priscacara, was a thicker-bodied, spiny-finned predator that resembles perch or sunfish. These fish had strong jaws and were likely hunters in their ecosystem.
 
When you find a well-preserved Priscacara, it’s often a showstopper, with visible teeth, pronounced spikey fins, and sometimes even fossilized stomach contents!
 
Learn more about fish fossils from the Green River Formation here - The Green River Formation, Wyoming: A Hotbed Of Fossilised Fish