BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 VOL. 24, PP. 529-572, PLS. 13-16 NOVEMBER 10, 1913 



PRE-WISCONSIN GLACIAL DEIFT IN THE REGION OF 

 GLACIER NATIONAL PARK, MONTANA 1 



BY WM. C. ALDEN AND EUGENE STEBINGER 



(Presented before the Society December 30, 1912) 



CONTENTS. 



Page 



Introduction 529 



Deposits on Belly River Ridge 531 



Ridge east of Waterton lakes 532 



Absence of peneplain remnants in southern Alberta 532 



Remnants of peneplains in Browning and Blackfoot quadrangles, Montana. 532 



Reason of difference in topographic development. 533 



Blackfoot peneplain and cycles of erosion 534 



Wisconsin stage of glaciation and the third set of plains 535 



Pre-Wisconsin drift on the Blackfoot peneplain 536 



Time and extent of the first mountain glaciation 539 



Deposits on Horsethief Ridge and Landslide Butte 541 



Comparison with the extension of Two Medicine Glacier of the Wisconsin 



stage 542 



Deductions from relations of pre-Wisconsin drift of the Keewatin ice-sheet. 545 



Extent of the upper and lower drift of the Keewatin ice-sheet 554 



Relations of the earlier and later drift of the mountain glaciers to that of 



the Keewatin ice-sheet in southern Alberta 555 



Relations of the "Saskatchewan" gravel 558 



Application of the name "Albertan" 563 



A possible intermediate stage of Cordilleran glaciation 566 



Summary 5(59 



Addendum 571 



Introduction 



At the meeting of this Society in December, 1911, the senior author 

 presented a paper under the same title as that above. 2 In that paper it 

 was set forth as having been determined in the preceding summer that 



1 Manuscript received by the Secretary of the Society March 19, 1913. 

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

 Second paper. 



2 Wm. c. Alden : Pre-Wisconsin glacial drift in the region of Glacier National Park, 

 Montana. Bull. Geol. Soc. Am., vol. 2:5, L911, pp. 687 708. 



XXXVI— Bull. Geol. Soc. Am., Vol. 24, 1912 { 529 ) 



