AGE IN EUROPE 
for the Quaternary Hall. Hall of the Age of Man. 
SOUTHEAST WING 
HALL OF THE AGE OF MAMMALS 
FOSSIL 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 the fossil 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. 
Careful guides and exhaustive cards of explanation, photographs, and 
window transparencies combine to make the entire exhibit illuminative 
and interesting. 
The particular feature of this hall is the wonderful series in the cases 
by the entrance and in the first aleove on the right showing the evolution 
of the horse in nature. The Museum is justly proud of this 
Evolution ; me : : ; 
Brie collection. Not only is it the largest and finest series of 
on fossil horse skeletons in the world, but it is larger than the 
combined collections of all other institutions, and it con- 
tains the earliest known ancestors of the horse, the little four-toed 
Eohippus, which was no bigger than a fox and on four toes scampered 
over Tertiary rocks. As will be seen by an examination of the skeletons 
of the horse and man, the modern horse walks on the tip of his middle 
finger and toe. The front hoof bone corresponds to the last joint of 
the third finger in the human hand, and the other bones of the leg corre- 
spond bone for bone with the structure of the finger, wrist and arm of 
man. The similarity in structure of the skeletons of horse and man 
is brought out in the exhibit of a rearing horse being controlled by 
man. A comparison of these two skeletons will show that although 
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