Found throughout the lake deposit is this unique ancestor of the true perch. This genus has been called Mioplosus and is easily identified by its elongnate form, intermixed canine-like teeth, and a spiny dorsal fin. It was first discovered in Fossil Syncline Lake, but can now be traced into other Eocene lakes and deposits. Five species have subsequently been described, but the vast majority of the finds occur at the Fossil Syncline Lake locality. The Mioplosus was a tertiary consumer which fed on smaller fishes within the middle and upper zones of the ancient lake as well as along the reed filled shoreline. Slow moving streams that flowed into the lake were also havens for this type of fish and probably served in part as periodic spawning grounds and food source environments.

Ulrich's Fossil Gallery
307-877-6466 • 307-877-3289 (fax)