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Eohippus (Horse) Tooth & Mesohippus Jaw Real Fossils +Display Box SDB #14628 13o


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This is a neat item - it's a set of 2 different horse fossils.  There is a tooth from Eohippus (Hyracotherium), a primitive horse that lived in the Eocene time period, approximately 50 Million years ago, and a jaw section from Mesohippus, a primitive horse that evolved from Eohippus, and lived about 30 million years ago.  This Eohippus tooth measures about 1/4 inch in length, and the Mesohippus jaw is 1 1/4 inch.  A nice glass-topped display box is included with the fossils.

Here is some information about the evolution of the horse from Wikipedia:  "The evolution of the horse, a mammal of the family Equidae, occurred over a geologic time scale of 50 million years, transforming the small, dog-sized, forest-dwelling Eohippus into the modern horse. Paleozoologists have been able to piece together a more complete outline of the evolutionary lineage of the modern horse than of any other animal.  Eohippus appeared in the Ypresian (early Eocene), about 52 million years ago. It was an animal approximately the size of a fox, with a relatively short head and neck and a springy, arched back. It had 44 low-crowned teeth.   For a span of about 20 million years, Eohippus thrived with few significant evolutionary changes.

In the late Eocene, the climate of North America became drier, and the earliest grasses began to evolve. The forests were yielding to flatlands, creating the type of environment resembling the present-day prairies.

In response to the changing environment, the then-living species of Equidae also began to change. In the late Eocene, they began developing tougher teeth and becoming slightly larger and leggier, allowing for faster running speeds in open areas, and thus for evading predators in non-wooded areas. About 40 million years ago, Mesohippus ("middle horse") suddenly developed in response to strong new selective pressures to adapt."

This is a great set!  We have a variety of other fossils available so be sure to check out our other listings!