SOUTHEAST WING 



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 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. ( 'aiv- 

 ful guides and exhaustive cards of explanation, photographs, and window 

 transparencies combine to make the entire exhibit illuminative and in- 

 teresting. 



.**' 



Restoration of Eohippus, 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 

 collection. Not only is it the largest and finest series of 

 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, 



77 



Evolution 

 of the 

 Horse 



