Eocene Epoch

A herring mass mortality slab fossil, Knightia eocaeria, from the Green River formation in Sweetwater Co., Wyoming

p4A ItemID D9689676
Early Eocene Diplomystus dentatus fish fossil from Wyoming

p4A ItemID E8957287
Phareodus fish fossil, full body, from Wyoming

p4A ItemID E8957053
Full-body fish fossil of an Eocene-era fish found in Wyoming

p4A ItemID E8956967

The Eocene Epoch

The Eocene epoch is the second oldest of the five major epochs of the Tertiary period of the Cenozoic era, or approximately 58 million years ago.


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