- State: WY
- NPCA Region: Northern Rockies
- Est. Date: 1972
Air & Climate DataView the Polluted Parks Report
You will find some of the world's best preserved fossils at the 50 million year old Green River Lake beds of Fossil Butte National Monument in Wyoming. If you want to get hands on, you can visit a fossil research quarry and assist park staff as they collect fossils.
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