Nearly 12 million years ago, volcanic ash engulfed this ancient watering hole in what is now Ashfall Fossil Beds in Nebraska, entombing innumerable creatures and creating a "Pompeii of prehistoric animals" :
Ashfall Fossil Beds | Nebraska Game & Parks Commission
Find family fun at Nebraska's Fossil beds | VisitNebraska.com
Ashfall Fossil Beds Stock Photo - Alamy
Outdoor Activities - Agate Fossil Beds National Monument (U.S. National Park Service)
Ashfall Fossil Beds opens for 31st season | Nebraska Today | University of Nebraska–Lincoln
Ashfall Fossil Beds: Visiting with Kids | Family Fun in Omaha
Ashfall Fossil Beds | Nebraska Game & Parks Commission
From Waterhole to Rhino Barn | Ashfall Fossil Beds
Nebraska's Unique Prehistoric Past | VisitNebraska.com
Benchmarks: June 1977: First Excavations at Nebraska's Ashfall Fossil Beds
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Ashfall Fossil Beds Is One Of Nebraska's Best Historical Sites