This is an undescribed fossil leaf from the Middle Eocene Ione Formation, western foothills of the Sierra Nevada. Note the well-preserved midrib (primary vein) and secondary veins; venation is pinnate. The margin is entire--that is, the edge of the leaf is smooth and non-serrated. Paleobotanists will most-assuredly be able to identify this specimen, eventually. The roughly 45 million-year-old specimen came from a n extraordinarily rich locality on private property in Amador County--a specific site currently under formal paleobotanical study by Dr. Jack A. Wolfe (retired member of the United States Geological Survey) and Howard E. Schorn (retired Collections Manager of Fossil Plants at the University California Museum of Paleontology in Berkeley), among others, who hope to use the fossils to help approximate the paleoelevation of the ancestral Sierra Nevada region during the geologic past.
Please note: All fossil localities in the Ione Formation of Amador County, California, presently occur on private property; explicit permission from the land owners must be secured before collecting fossils there.