Green River Fossils

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Fossil Fishes & More

Wyoming, USA

Discover why Green River fossils are so special, and check out amazing specimens of extinct species that reveal what Wyoming looked like 52 million years ago!

Courtesy of Lance Grande, Illustration by M. Donnelly

Green River Lake System

© The Field Museum, GEO86416_127d, J. Weinstein

Green River Fossils

Courtesy of Lance Grande

Lake and Land Life

Courtesy of Lance Grande

States of Decay

© The Field Museum, GEO86452_08d, J. Weinstein

Fan Palm & Fish

© The Field Museum, GEO86416_045d, D. Scher

Fossilized Flower

© The Field Museum, GEO86416_063d, J. Weinstein

Lotus Leaf

© The Field Museum, GEO86697_02d, J. Weinstein

Leaf with Infestation

© The Field Museum, GEO86416_023d, D. Scher

Damselfly

Courtesy of Lance Grande

Crab Spider

© The Field Museum, GEO86416_051d, D. Scher

Frog

© The Field Museum, GEO86416_094d, D. Scher

Iguana Lizard

© The Field Museum, geo85506c, J. Weinstein

Primitive Crocodile

© The Field Museum, GEO86416_109d, D. Scher

Food Chain

Courtesy of Lance Grande

Pregnant Stingray

Courtesy of Lance Grande

Mass Mortality

© The Field Museum, GEO86416_072d, D. Scher

Perching Songbird

Courtesy of Lance Grande

Primitive Parrot

© The Field Museum, GEO86416_106d, D. Scher

Early Bat

© The Field Museum, GEO86416_123d, D. Scher

Carnivorous Mammal