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which were seen in the Black Hills, were usually met with around the 
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| — base of these hills, dipping at high angles away from them, while the 
Tertiary formations were found to repose unconformably upon their up- 
turned edges. 
(2.) Letter from Dr. J. Lewy to Lieut. G. K. Wanrrey, U.S. Top. 
ance wi our request, [ send you a brief ‘notice of the remains of 
extinct animals collected by Dr. F. V. Hayden in the Valley of the 
n 
Nebraska, A remarkable fact exhibited by the Niobara fossils, is, that 
the fauna of the Pliocene or later Tertiary period in this country, was 
much more nearly like the recent one of the Eastern hemisphere than 
our own recent indigenous fauna. 
The collection is particularly rich in remains of ruminating and equine 
_ Animals, which are mingled with those of several carnivorous and gnaw- 
ing animals, and others of a Rhinoceros, a Mastodon and an Elephant. 
xcepting a species of Deer, all the ruminant remains belong to extinct 
hera. One of these is especially interesting as it belonged to the Camel 
Smnall species of fox. The gnawers consist of a small species of beaver 
and a species of porcupine. 
SECOND SERIES, Vor. XXV, No. 75.—MAY, 1886. 
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