Fossil Phyllites Leaf - Green River Formation

This is a 1.71" fossil leaf from Phyllites winchesteri. It is Eocene in age and comes from the Green River Formation. The dark preservation contrasts well against the lighter shale matrix and fine details of the leaf structure can be seen.

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.