Fossil Populus (Poplar) Leaf - Green River Formation

This is a fossil leaf from the plant Populus wilmattae, a type of Poplar. It is Eocene in age and comes from the Green River Formation. The dark preservation contrasts well against the lighter shale matrix.

It comes the Green River Formation and the area in Uintah County, Utah. This is the same formation that is famous for producing well preserved fish fossils, but a different member and location.