708 W. C. A'LDBN PRE-WISCONSIN GLACIAL DRIFT IN MONTANA 



preglacial. A part at least of them may be outwa^h correlated with this 

 old drift. 



In regard to Professor Coleman's statement concerning the three drift 

 sheets differentiated by Doctor Dawson, I am as yet uncertain as to the 

 relations of this pre-Wisconsin drift to that described by Doctor Dawson, 

 As I understood the statements in Doctor Dawson's papers, his old drift 

 was traced up the valleys between the higher foothills, although scattered 

 boulders were found on the latter. Here the old drift lies thick on top 

 of the highest of the foothills. 



