A paleontological site preserving exceptionally detailed prehistoric fossils within an active excavation environment.

How to Get There

Take US-20 West from Sioux City, continue into Nebraska toward Royal, then follow signs north to the park entrance.

Overview

The Ashfall Fossil Beds offer an unparalleled window into the Miocene epoch, preserving the remains of rhinoceroses, horses, camels, and other wildlife that perished nearly 12 million years ago. Encased in volcanic ash from a distant supervolcano eruption, these fossils remain in extraordinary condition, allowing visitors to observe articulated skeletons exactly as they were discovered. The Rhino Barn, an enclosed excavation structure, provides a rare opportunity to witness paleontologists uncovering fossils still embedded in their ancient resting place. Visitors can explore interpretive displays detailing the geology, ecosystem, and dramatic natural events that created this remarkable site.

Beyond the fossil beds, the surrounding prairie landscape tells its own story, shaped by millions of years of ecological shifts across the Great Plains. Trails guide travelers through rolling grasslands, where volcanic ash once blanketed a watering hole that drew herds of animals seeking relief. Educational programs and hands-on exhibits deepen the experience, while the site’s active research environment highlights its ongoing scientific importance. Ashfall Fossil Beds stands as a rare convergence of natural history, geology, and paleontology, inviting visitors to step back through deep time and witness a prehistoric world preserved in ash.

This article uses material from the Wikipedia articles and official tourism pages for the Ashfall Fossil Beds State Historical Park, which are released under the Creative Commons Attribution-Share-Alike License 3.0.