3UN19189 1 ) 



ARTICLE II. 



THE MAMMALIA OF THE DEEP RIVER BEDS. 



BT W. B. SCOTT, 



COLLEGE OF NEW JERSEY, PRINCETON. 



Read before the American Philosophical Society, October 6, 1893. 



The ninth Princeton geological expedition to the Tertiary formations of the Far 

 West selected as its field of operations the valley of Smith river, or Deep creek, as 

 it is variously called, in central Montana. The party, which was under the direction 

 of the writer and Prof. W. P. Magie, consisted of the following students : Messrs. 

 Butler, Benet, Coulter, Hosford, Jefferson and Stevenson, and spent a part of the 

 summer of 1891 in exploring the very limited outcrops of lacustrine beds iu the 

 region mentioned. "We had the good fortune to secure the services of Prof. O. C 

 Mortson, of Great Palls, Mont., as a guide, and to his minute knowledge of the 

 country and zealous labors the success of the undertaking is in large measure due. 



Many gentlemen iu Great Falls, "White Sulphur Springs and Livingston took 

 great interest in the work of the expedition and rendered every assistance in their 

 power. To enumerate all of those to whom we are under obligations for many kind- 

 nesses would be impossible, but special thanks are due to the Hon. Paris Gibson and 

 Mr. W. W. Connor, of Great Falls, but for whose most kind and prompt assistance 

 at a critical period the trip would necessarily have been abandoned. 



Geological Museum, Princeton, N. J., September 20, 1893. 



The literature of the Deep River or " Ticholeptus" beds is rather limited, as the 

 region has been comparatively little explored. The formation was first discovered by 

 Grinnell and Dana, in 1875, and their brief account may be quoted almost in full. 



"During the explorations carried on last summer under the direction of Col. 

 "William Ludlow, Corps of Engineers, a series of Tertiary deposits were identified by 

 the writers near Camp Baker, Montana. These deposits indicate the existence in 



A. p. s.- — VOL. xvin. h. 



