Legume Family Leaf from Green River Formation

Name: Family: Leguminosae: Leguminosites lesquereuxiana

Age: Eocene

Size (25.4 mm = 1 inch): Leaf: 35 mm by 17 mm Matrix: 48 mm by 68mm

Location: Green River Formation, Uintah County, Utah

Description: The Green River Formation deposits of Wyoming, Colorado, and Utah are best known for their immaculately-preserved fish, but other examples are known as well, as this specimen attests. This is an example of a leaf from a member of the Leguminosae (Pea family), one of the largest of families of flowering plants. The family holds several plants of use to man as a food source due to the fact that they harbor nitrogen fixing bacteria, and so need little to no additional fertilizer. The deep brown color is a fine contrast to the light shale matrix, with the leaf well centered on the plate.

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