
SOUTHEAST WING 
Fosstt MAMMALS OF THE TERTIARY PERIOD 
Return to the East Corridor and continue into the Southeast Wing or 
Tertiary Hall which contains the Fossil Mammals of the Tertiary Period. 
The geological age to which all the fossils shown in this hall belong, 
covers a period of from 100,000 to 3,000,000 years. At each side of the 
entrance are charts indicating the successive periods of time from the 
Triassic to the Tertiary, and the animal life which pertained to each. Care- 
ful guides and exhaustive cards of explanation, photographs, and window 
transparencies combine to make the entire exhibit illuminative and _ in- 
teresting. 

Restoration of EHohippus, the four-toed horse. This ancestor of the modern horse, 
scarcely larger than the red fox, lived some three millions of years ago. It comes from the 
Lower Eocene of Wyoming and New Mexico 
The particular gem of this hall is the wonderful series in the cases by 
the entrance and in the first alcoves on the right showing the evolution of 
the horse in nature. The Museum is justly proud of this 

eae collection. Not only is it the largest and finest series of 
Horse fossil horse skeletons in the world, but it is larger than the 
combined collections of all other institutions, and it contains 
the earliest known ancestors of the horse, the little four-toed Eohippus, 
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