Morrill Hall will operate the following hours during the UNL Winter Break

December 23-25: Closed | December 26-28: Open 9am-5pm | December 29: Open 12-5pm | December 30-January 1: Closed | January 2: Resume normal museum operating schedule.

Our Family of Museums:

Science & Culture | Vertebrate Paleontology

Ashfall Fossil Beds

Ashfall Fossil Beds State Historical Park in Antelope County, Nebraska is a joint operation of the University of Nebraska State Museum and the Nebraska Game and Parks Commission. The Museum is responsible for all educational and scientific programs at the Park, as well as excavation, preparation and preservation of the fossils themselves.

Brief History

Ashfall Fossil Beds, a Museum locality originally named Poison Ivy Quarry, was discovered in 1971 by paleontologist Mike Voorhies. A scientific excavation was carried out between 1977 and 1979. Over these three field seasons, nearly 100 complete rhinos (of the genus Teleoceros) were discovered and collected, along with dozens of horses, camels, turtles, cranes, and other animals. In the mid 1980's, Mike (shown here working on the skull of a rhino) and his crew returned to the site to continue explorations and assist with the preliminary plans for a new state park. Our intent this time was not to collect the fossils, but to expose them and leave them in place in the volcanic ash for people to see!

The state of preservation of the skeletons at Ashfall is astounding and provides us with a detailed glimpse of Nebraska 10 million years ago. Aspects of population dynamics, diet, disease processes, and even social behavior are also preserved here as they are at no other known site. Complete skeletons of mammals are rare in the fossil record and add tremendously to our understanding of an animal's anatomy. Catastrophic events that preserve populations or communities of animals are incredibly rare and give paleontologists the equally rare opportunity to do highly detailed studies of such things as population dynamics, sexual dimorphism, variation and behavior.

Read the full history Ashfall: Life and Death at a Nebraska Waterhole Ten Million Years Ago by Mike Voorhies.

Photo Gallery

  • Greg Brown

    Preparator Greg Brown prepares a probable mother-baby pair of rhinos named "Sandy" and "Justin" by the crew. Preserved in their death positions and touching noses, it is easy to sense the agony they must have felt in their last moments of life. Several other similar associations, many with young rhinos actually in nursing position along side adult females, were excavated from the site in the late 1970's.

  • Ellen Stepleton

    Preparator Ellen Stepleton works on the skeleton of an adult female rhino named "Amy". Remarkably, this rhino still carries within it's pelvic cavity the bones of her unborn calf. A closer look also shows that her shoulder has been scavenged by some opportunistic carnivore, and her stomach and mouth contain the remains of her last meal: grass seeds and leaves. Amy is one of more than 25 skeletons (permanent residents!) so far exposed and visible in the Rhino Barn.

  • Morris & McGrew

    Two of Ashfall's 1979 celebrities, complete adult rhinos "Morris" (foreground) and "McGrew" (Background). "Morris" (a male with large tusks and big feet!) and "McGrew" (a female with small tusks and unborn calf) confirm the previously-suspected differences between males and females of this species.

  • Amy & Dr. Marie

    Within this view are the rhinos "Amy" and "Dr. Marie", a small three-toed horse (Pseudhipparion), a small deer-like animal (Longirostromeryx), a camel, and numerous scattered bones. "Dr. Marie" was named after the person who first described the abnormal bone growth associated with severe lung damage or disease. This condition is occasionally found in living animals and humans, but is seldom seen in fossils. Because it is present in every animal found at Ashfall, however, it is likely that the lung damage was caused by breathing large quantities of volcanic ash.

  • Aerial view

    An aerial view of a portion of the Ashfall site. This photo was taken during the Park's development and shows a series of 6-meter sampling grids laid out on the newly-exposed surface of the ash bed. The overburden (sand and sandstone) and the upper 3 to 5 feet of volcanic ash have been removed, leaving the fossils safely buried under another 5 feet of ash. The Hubbard Rhino Barn (not yet built when this photo was taken) now covers the area at the bottom of the picture. Exploration has indicated that this is a very small portion of the actual bone-bed. Much work remains to be done here, and many more exciting discoveries will be made in the future, perhaps even while you are watching!

Related Content