Paleontology Sites


White Sea
Burgess Shale
Mazon Creek
Hell Creek
Green River
La Brea Tar Pits

WEB Sites

The Museum of Western Colorado, Dinosaur Valley Museum
Western Paleo Labs Gallery: Green River Formation Specimens
Warfield Springs Fossil Quarries

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Paleontology Sites

Green River Formation

Located in western Colorado, eastern Utah and southwestern Wyoming the Green River Formation dates to the Cenozoic Era, Eocene Epoch period (about 49.7 and 50.7 million years ago). The geologic formation is primarily composed of sedimentary rocks, like oolitic grindstones, packstones, mudstones, and oil-producing shale.

In Europe and Asia, Eocene fossil localities are incomplete or have been disturbed, so the fact that the Green River locality is so complete allows scientists to form a more comprehensive picture of this Era.

Steven Sanouvong & Tak Wong