Oligocene White River fossil Rhino Jaw Hyracodon Wyoming

Description

A fossil rhino jaw,
Hyracodon nebraskensis
, from the Oligocene White River deposits of Converse County, Wyoming.
The specimen is 9" long containing 10 teeth and is free of matrix.
The jaw consists of the left dentary, 3 incisors, 1 canine, 3 pre-molar and 3 molar teeth.
There is a partial pre-molar from the right dentary preserved as well.
The specimen has been consolidated with glue and minor surface cracks have been repaired along the molars, total restoration under 5%.
Hyracodon was a lightly built, pony-like mammal of about 1.5 m (5 ft) long. Its skull was large in comparison to the rest of the body. Hyracodon's dentition resembled that of later rhinoceroses, but it was a much smaller animal and differed very little in appearance from the primitive horses of which it was a contemporary (32–26 million years ago). It had a short, broad snout and its long, slender limbs had three digits.
Like the primitive horses, hyracodonts inhabited open forests and wooded steppes and turned from browsing foliage to grazing grass. They died out without leaving any descendants and they mark the end of the phylogenetic branch of hornless, running rhinoceroses.
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This fossil was collected and/or obtained legally and is being sold legally.