INTRODUCTION 531 



In September and October, 1912, the writers examined the deposits 

 on most of the other remnants of the high-level plains in this region — 

 that is, in the Blackfeet Indian Eeservation east of Glacier Park — and 

 made a reconnaissance trip in southern Alberta to examine the relations 

 of the deposits described by Dawson and McConnell. In the course of 

 this trip the writers crossed the boundary September 9 and moved by 

 stages northward, camping a few days in each place, to Macleod, spent 

 a day in the vicinity of Lethbridge, went westward up the valley of Old- 

 man Eiver to a few miles beyond the junction of the north and south 

 forks of this stream, examined a portion of the southern part of Porcu- 

 pine Hills, went southward from Pincher to Waterton lakes, and thence 

 eastward around the foothills past Upper Belly Eiver, and finally re- 

 crossed the International Boundary at Pike Lake west of Saint Mary 

 Eiver on October 3. While the opportunities afforded by such a trip so 

 late in the season did not permit of exhaustive studies in any place, yet it 

 afforded an excellent general view of the composition and relations of the 

 several Pleistocene deposits and furnished a basis for interpretations pre- 

 sented in this paper. 



Deposits on Belly Eiver Eidge 



Between Belly Eiver on the west and the heads of Lee Creek on the 

 east a high ridge, which may be designated as Belly Eiver Eidge (plate 

 13), extends northward to a point 5 or 6 miles across the boundary. At 

 the abrupt north end this stands about 1,300 feet above Belly. Eiver, or 

 about 5,750 feet above sealevel. This ridge is capped with about 100 

 feet of glacial drift, which is exposed in several places in scarps left by 

 landslides on the underlying Cretaceous or Tertiary clays and shales. 

 The drift is composed of angular to subangular (and some well rounded) 

 pebbles and boulders up to 5 feet in length, representing the several 

 kinds of rock from the mountains, embedded in a matrix of clay. 

 Glacially scored stones are not abundant, but search resulted in finding 

 numerous well striated pebbles of greenish argillite (plate 14, figure 1). 

 In the upper part there are almost no pieces of limestone, though these 

 are plentiful lower down. Evidently such have been removed by solu- 

 tion, and ledges of tillite outcropping 10 to 15 feet below the top of the 

 section show the results of cementation by the calcium carbonate carried 

 down by percolating waters. 



The drift here is of the same character as that found in 1911, 8 to 10 

 miles farther south on this same ridge, west of Chief Mountain, at eleva- 

 tions of 6,000 to 6,300 feet above the sea, and also on Kennedy, Swift 

 Current, Boulder, Saint Mary, and other ridges near the mountain front, 



