46 G. M. DAWSON — GLACIAL DEPOSITS OF SOUTHWESTERN ALBERTA. 



in character with those noted in the report of 1882-'84 as occurring near 

 the lower part of Waterton river at a height of between 3,200 and 3,300 

 feet,* and it may be added here that boulders of the same kind were 

 found b}^ Mr McConnell on the northern part of the Porcupine hills at a 

 height of 3,950 feet, and on the Nose hills near Calgary at 3,940 feet. 



At 3,316 feet is a boulder-strewn terrace with some pretty large boul- 

 ders, both of Rocky mountain and Laurentian origin ; at 3,387 feet, 

 another terrace similarly characterized ; at 3,532 feet, a terrace with rolled 

 gravel on the surface and an abundance of eastern drift, and again at 3,643 

 feet occurs still another well marked and wide terrace with similar mixed 

 drift. 



From this a descent was made to our camp on Oleson creek (3,600 feet) 

 and from this place, in the course of a rather long excursion in the hills 

 to the northward, the following terrace4evels at greater altitudes were ob- 

 served. These are briefly enumerated below, but it must be understood 

 that many more such levels n:iight have been noted had further time been 

 given to the investigation. Possibly, at a distance of some miles, a quite 

 different series of water-levels would have been recognized, for it appears 

 probable that almost every stage in a gradual descent of the water-line 

 may be found to be marked in some part of the Porcupine hills. 



3,853 feet, a terrace-like flat with rolled quartzite and Laurentian gravel. 



3,877 feet, an evident terrace with similar gravels, including some Rocky mountain 



limestone. 

 3,898 feet, a faintly impressed terrace with similar gravels. 

 4,182 feet, ai)proxinuitely, a terrace with similar gravels. 

 4,281 feet, a terrace with similar gravels. 

 4,349 feet, a terrace with similar <rravels, many laro;e well rounded stones, and a 



considerable i)r()})ortion of Hmestone referal)le to the AV^innipeg basin. 

 4,505 feet, a flat-topped hill, tlu^ lii,<rhest in this vicinity, and evidently marking a 



terrace-level, covered witli similar well rolled gravels, including Rocky 



Mountain quartzites and limestone, as well as Laurentian gneisses and 



Winnipeg limestones. 



It is thus evident that from tlie level of Macleod to the highest point 

 above noted there is an uninterrupted series of terraces, covered with well 

 rounded pebbles of mixed eastern and western origin. The erratics of 

 eastern origin are not less abundant at higher than at lower levels, and 

 while some of the Rocky Mountain stones are of considerable size, the 

 gneissic Laurentian boulders are, on the whole, larger at high levels, being 

 often as much as three feet in diameter, while some large pieces of Win- 

 nipeg limestone were also seen at the highest levels. No glaciated stones 

 were observed on these higher terraces, nor any signs of glaciation on the 



* Op. cit. 14 pp. 8, C, 149 c. 



