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Updated: May 14, 2025
In the territory of Nebraska, on the Upper Missouri, near the Platte River, latitude 42 degrees N., a tertiary formation occurs, consisting of white limestone, marls, and siliceous clay, described by Dr. Among these, Dr. Leidy describes a gigantic quadruped, called by him Titanotherium, nearly allied to the Palaeotherium, but larger than any of the species found in the Paris gypsum.
The most important of the numerous animals of the Tertiary Age yet discovered in the Hills and surrounding region, are the Titanotherium or Brontotherium, similar to our Hippopotamus, the Oreodon, and a small horse having three toes on each foot.
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