BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol. 23, pp. 687-708, PLS. 37-40 NOVEMBER 28, 1912 



PRE-WISCONSIN GLACIAL DRIFT IN THE REGION OF 

 GLACIER NATIONAL PARK, MONTANA^ 



BY WILLIAM C. ALDEN 



{Read before the Society December 28, 1911) 



CONTENTS 



Page 



Existing glaciers and Wisconsin glaciation 687 



Topography of the plain 690 



Deposits on Two Medicine Ridge 691 



Deposits on Cut Bank Ridge 693 



Deposits on Milk River Ridge 694 



Deposits on Saint Mary Ridge 696 



Deposits on ridge west of Lower Saint Mary Lake 699 



Deposits on Boulder Ridge 699 



Deposits on Swiftcurrent Ridge 700 



Deposits on Kennedy Ridge 702 



Deposits in the vicinity of Belly River 704 



Age of the high-level drift 705 



Discussion 707 



Existing Glaciers and Wisconsin Glaciation 



During the field season of 1911 the writer had the pleasure of being 

 associated with Mr. M. R. Campbell, Dr. T. W. Stanton, Mr. J. R. 

 Hoats, and Mr. J. Elmer Thomas, of the U. S. Geological Survey, in 

 initiating a geological survey of Glacier National Park, Montana, his 

 particular assignment being the study of past and present glaciation and 

 associated phenomena^ (plate 37). 



1 Manuscript received by the Secretary of the Society April 15, 1912. 

 Published by permission of the Director of the U. S. Geological Survey. 



2 It should be stated that while the surveying done by this party during the past field 

 season was carried on in detail wherever there was opportunity, the work as a whole 

 was rather in the nature of a general reconnaissance, the object being to get the various 

 problems in hand, but not to complete the investigation of any of them. In some re- 

 spects, therefore, the conclusions set forth In this paper are to be considered as tenta- 

 tive and subject to such modification as further studies make necessary. 



The topography of Glacier I'ark and of the western part of the lUackfec t Indian 

 reservation, including the features here described, is delineated on the new topographic 

 map of the park and. excepting the southern part, on the Browning, Chief Mountain, and 

 Kintla Lake topographic sheets. 



(687) 



