Fossil Alder Leaves From Copper Basin, Nevada

Upper Eocene Dead Horse Tuff

Here are two fossil leaves from the upper Eocene Dead Horse Tuff, Copper Basin, Nevada: at left is a fragmentary specimen of an alder, Alnus cuprovalis; at right is a complete leaf from the alder, Alnus jarbidgiana--both specimens are among the most common plant remains recovered from the Dead Horse Tuff. The carbonized leaves are 38 to 39 million years old.

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