North America, Western United States, South Dakota, Pennington County, White River / Upper Brule Formation, Oligocene, ca. 33 to 30 million years ago. A fossilized upper palate bone and teeth from a prehistoric mammal known as Hyracodon nebraskensis, one of the earliest relatives to modern rhinoceros! The bone is mounted on a wooden display stand. Hyracodon was a small pony-like ungulate with long, slender limbs for speed, but 3-toes, browsing the open forests and grasslands of North America. Although visually similar to primitive horses, Hyracodon are often referred to as hornless "running rhinos" to indicate their relation to later genera. The premolars have central cavities that later rhinoceros relatives also had for grinding up leaves and grasses as they traveled in small herds. Size of fossil: 8" L x 5" W x 2" H (20.3 cm x 12.7 cm x 5.1 cm); 3" H (7.6 cm) on included custom stand.

Provenance: private New Jersey, USA collection

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#182394

Professionally prepared with expected repairs and restoration. Front incisors are restored from new material. Nearly complete molars and pre-molars, the right premolar (PM1) is restored from new material.