010031 - Nicely Preserved Knightia Fossil Fish Eocene Green River Fm, Wyoming (USA) Crinoids The teeth of this shark

The teeth of this shark are large with a triangular crown

Awesome natural association with 3 pyritized specimens

You can also see a partially disarticulated calyx with its corresponding arms

but to a reptile such as a crocodile or a turtle

Impressive piece worthy of exposure

010031 - Nicely Preserved Knightia Fossil Fish Eocene Green River Fm, Wyoming (USA) Crinoids The teeth of this sharkMagnificent specimen with detailed preservation. You can see the whole bone structure as well as details of the jaw and its small teeth. From this type of fossilization, through taphonomy, many aspects of the original paleoenvironment can be learned. This type of preservation only occurs under certain very special circumstances, in the bottoms of lakes, with anoxic conditions, for example.