Eocene Period, 58-36 million years BP. A matrix displaying three fossil Populus sp. leaves and a Salix sp. leaf. 955 grams, 17.2cm (6 3/4"). From an old Bristol paleontological collection; from the Green River Formation, Uintah County, Utah, USA. The Green River Formation holds one of the world’s richest deposits of fossil leaves, plants, vines and aquatic vegetation. [No Reserve] Very fine condition.