Hyracodon nebrascensis was a sheep sized mammal which reached a length of about five feet with long legs for running. Its horse-like appearance gave it the name "running rhino." It was a browser that likely roamed in small herds in the plains and open forests. It lived during the Oligocene (32-30 million years ago).
Because of replacement minerals, most of the fossil mammal teeth from the White River Formation of Nebraska will fluoresce to some degree. The teeth are usually replaced by calcite, which will fluoresce a yellow-white to yellow-orange. Any green showing up on the specimen is usually chalcedony and is usually part of the bone or bone marrow. On a few specimens there may be a bright green at the base of the specimen this will be an oil based clay holding up the specimen. Any purple on the specimen is the UV light reflecting off the light colored areas of the specimen and is not fluorescence. The fossil teeth from Nebraska will fluoresce under either long or short wave, but they fluoresce best under both at the same time. You may see a photo of some of the specimens under normal light or fluorescent light by returning to the main page and clicking on the link "to view specimen material from Nebraska." You may also view all teeth by going to the fossil teeth or fluorescent page and then to the appropriate page for the teeth you want to view. The item number will be the same as the number in the fluorescent section without the "F" at the end of the number.
This specimen is a jaw section with several teeth. The specimen is from the White River, Brule Formation. The first photo was taken under long wave ultraviolet light. The photo below was taken under short wave ultraviolet lighting.
Kingdom: Animalia, Phylum: Chordata, Class: Mammalia, Order: Perissodactyla, Family: Hyracodontidae, Subfamily: Hyracodontinae, Genus: Hyracodon, Species: nebrascensis.
Running Rhino - Hyracodon nebreascensis 
Quantity in Basket: None
Code: TNERR-101F
Price: $75.00
Shipping Weight: 0.72 pounds
Time: Early Eocene through Early Oligocene, approximately 40 - 30 million years ago.
Location: White River Formation, Brule Member, Harrison, Nebraska, USA
Dimensions: 4-1/4" x 2-3/8" x 7/8"