"GLACIAL WORK IN THE WESTERN MOUNTAINS 



IN 1901.' 



During the season of 190 1 some time was given to the 

 study of Pleistocene problems in the western mountains. Four 

 small parties, beside the writer, were in the field. The work of 

 three of the four parties was the somewhat detailed study of 

 selected areas, and was intended to make known the general 

 conditions of glaciation at several somewhat widely separated 

 localities. When a sufficient number of selected areas have 

 b|^ep studied similarly, the results will afford a basis for pre- 

 lir^inary conclusions concerning the course of Pleistocene his- 

 tgrji in the western mountains, and will be helpful in guiding 

 future work. The work of this summer was intended as the 

 beginning of study looking to this end. 



..p^ The writer spent about six weeks in the region, mostly in 

 association with the parties referred to. One party was in north- 

 weS|tern Montana, east of the Rockies ; one farther west, on the 

 western side of the Rockies, in northwestern Montana, northern 

 Idaho, and eastern Washington ; one in the Wasatch Mountains ; 

 and one in the mountains of New Mexico, a few miles northeast 

 of Santa Fe. 



The following brief summary will give some idea of the 

 work done : 



NORTHWESTERN MONTANA, EAST OF THE ROCKIES. 



Mr. Fred H. H. Calhoun, accompanied by Mr. Bruce 

 McLeish, spent three months in the northwestern part of Mon- 

 tana. The area studied, some 8000 square miles in extent, lies 

 just south of the 49th parallel, and just east of the Rocky 

 Mountains. It is the area in the angle between the Continental 

 ice sheet from the northeast, on the one hand, and the Cordil- 

 leran ice sheet from the northwest, and the mountain glaciers 

 from the west, on the other. 



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



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