010029 - Nicely Preserved Knightia Fossil Fish Eocene Green River Fm, Wyoming (USA) Pterosaur The size of this fragment

The size of this fragment of Onchopristis rostral bone is probably only about a third of its original length

Impressive specimen of the genus Acanthopyge

it is a wonderful piece representing this group of trilobites

west of Hamada du Guir

010029 - Nicely Preserved Knightia Fossil Fish Eocene Green River Fm, Wyoming (USA) Pterosaur The size of this fragmentMagnificent 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.