1.8" Detailed Leguminosites Lesquereuxiana Fossil Plant Leaf Eocene Green River FM Utah

Leguminosites lesquereuxiana Fossil Leaf – Early Middle Eocene from the Green River Formation

This well-preserved Leguminosites lesquereuxiana fossil leaf originates from the early Middle Eocene shales of the Green River Formation, spanning present-day Utah, Colorado, and Wyoming. Dating to approximately 53–48 million years ago, the specimen displays distinct venation and fine morphological detail, characteristic of legume-related foliage preserved in calm lacustrine (lake) environments.

While the Green River Formation is world-renowned for its exceptionally detailed fish fossils, its deposits also preserve a remarkable diversity of plants, invertebrates, reptiles, mammals, and even Eocene stromatolites. Fossil leaves assigned to Leguminosites are abundant within these strata, indicating that legume-type plants were an important component of the vegetation surrounding the large freshwater lakes where the sediments accumulated.

Occasionally, plant fossils from this formation are found in association with small insect impressions, though insects remain comparatively rare in the Green River fossil record. These associations provide valuable insight into ancient ecological relationships between plants and arthropods during the Paleogene.

Specimens such as Leguminosites lesquereuxiana contribute significantly to our understanding of Eocene forest composition, climate conditions, and plant diversity in North America. Ideal for collectors, educators, and museum exhibits, this fossil leaf offers a tangible glimpse into the lush ecosystems that flourished millions of years ago along the shores of prehistoric lakes.