A Diplomystus dentatus fish, Green River Formation, Wyoming, USA.
The fossil is 50 million years old, from the Eocene.
It was a surface feeder as can be seen from the upturned mouth, and they preyed on smaller fish such as Knightia.
50 million years ago a lake existed in what is now Wyoming, with a size of around 930 square miles. The unusual chemistry of the lake prevented decay and the scavenging of the dead organisms, while thin layers of alternating limestone and organic matter slowly accumulated.
Super definition and condition.
Plate Size: 17.5 cm x 12.5 cm & Fish 13 cm long
- Fossil Bony Fish
- on original matrix - Green River, Wyoming
- Scientific name
- Diplomystus dentatus
- Geological Period
- Good condition