Framed Priscacara serrata Positive/Negative | Green River Formation | Wyoming
Frame approx. size: 16" x 11.75" x 1.75"
Priscacara positive approx. size: 4"
Priscacara negative approx. size: 3.5"
This impressive specimen has the positive of a small Priscacara serrata on the left, and the negative left behind by the Priscacara serrata on the right. The original frame divides the two while still highlighting that this is two parts of the same fish. The back of the frame has Wallace Ulrich's notes on the specimen. They read as follows:
Family Moronidae - C. liops, P. serrata, H. hypsacantha, and undescribed Priscacara & Hypsiprisca species
P. serrata is perhaps the most popular and sought after of the Green River Formation fish fossils. The Moronidae are a family of perciform fishes, commonly called the temperate basses. P. serrata is an uncommon find compared to Cockerellites liops, which are often confused without proper examination and preparation. P. serrata are typically larger than C. liops. The best preserved fossils are extracted from the famous "18-inch Layer" on either very sunny days or at night under halogen lights. The reason for this is because a fine layer of limestone shale covers the fossils, and we need to see protruding backbones cast a shadow in order to find the fossils.