Platanus wyomingensis
Eocene
Green River Formation, Parachute Creek Member
Near Bonanza
Utah, USA.

Fossil leaf of Platanus wyomingensis from the Parachute Creek Member of the Green River Formation near Bonanza, Utah. This specimen dates to the Eocene Epoch, approximately 50 million years ago, when lush forests surrounded the ancient lakes of the Green River Basin.
Big 80mm leaf on 152mm slab