FOSSILS

Fossil leaf (Acer lesquereuxi), an ancient maple or sweet gum. Found in the Green River Formation. Eocene period, about 45 million years ago. Douglas Pass, Garfield Co., Colo. (Collection of the Colorado School of Mines Geology Museum. Golden, Colo.)

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Fossil leaf (Acer lesquereuxi), an ancient maple or sweet gum. Found in the Green River Formation. Eocene period, about 45 million years ago. Douglas Pass, Garfield Co., Colo. (Collection of the Colorado School of Mines Geology Museum. Golden, Colo.)

Copyright Ron Wolf/Tom Stack & Associates

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