AMERICAN 
JOURNAL OF SCIENCE AND ARTS, 
[THIRD-«SERIES.] 
Art. XX.—The Hot Springs and Geysers of the Yellowstone and 
Firehole Rivers; by ¥. V. HaypEN. With maps.* 
(Published by permission of the Secretary of the Interior.) 
sometimes applied to the entire valley; but the basin proper 
comprises only that portion enclosed within the remarkable 
ranges of mountains, which give origin to the waters of the 
Yellowstone, south of Mount Washburn and the Grand Cafion. 
The range, of which Mount Washburn is a conspicuous peak, 
seems to form the north wall or rim, extending nearly east an 
west across the Yellowstone, and it is through this portion of 
the rim that the river has cut its channel, forming the remark- 
able falls and the still more wonderful cafion. This basin is 
gang h 
at side, without any apparent break in the mm 
This basin has.been call 
of an ancient voleano. It is probable that during the Pliocene 
period, the entire country drained by the sources of the Yellow- 
stone and the Columbia’ was the scene of as extensive volcanic 
activity as that of any portion of the globe. 
* The charts accompanying these articles were prepared by Mr. E. Hergesheimer, 
@ most accompli pographer connected with the U. S. Coust Survey. 
Am. Jour. Scr.—Tuirp Serres, Vou. II, No. 15.—Mancu, 1872. 
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