THE KANSAN ICE INVASION 279 



4. Rocks and clay, about all rocks 3 feet 



5. Blue clay and small stones 7 " 



6. Gray sand 1 " 



7. Soft blue clay with layers of sand one inch thick about every two feet, no pebbles 



or boulders 234 " 



Height of section 267 " 



In the bed number 7, at a depth of 200 feet, a piece of wood was found which 

 Prof. Penhallow has named Larix ckurckbridgmsis. The same species has 

 been reported from southern Manitoba in postglacial deposits. 142 



In the vicinity of the Bow and Belly rivers, between 110 and 115 degrees 

 west longitude, and just north of the United States boundary, a general sec- 

 tion is found to be as follows: 143 



Stratified sands, gravels and silts 



Upper boulder clay 



Interglacial deposit with peat 



Lower boulder clay 



Quartzite shingle and associated beds. 



At Wolf Island, Belly River, a section exhibited 173 feet, as noted below: 



Correlation Character Depth 



Wisconsin till Boulder clay 100 feet 



Yarmouth interval Interglacial deposit with peat 8 " 



Kansan till Boulder clay 15 " 



{Yellowish & brownish-yellow sands 15 " 



Purplish-gray clay 4 " 



Yellow sands 6 " 



Nebraskan till Quartzite shingle , 15 " 



Cretaceus shales and sandstones 10 " 



Height of section 173 feet 



The deposits beneath the lower boulder clay are probably referable to the 

 Aftonian interval and the Nebraskan drift. No organic remains are reported. 



The Ficus described by Hollick, 143a and referred to the Aftonian on a pre- 

 vious page, may be of Yarmouth age. No age is assigned to the deposit by 

 Hollick nor is the species named other than to genus. 



12. ALASKA 



Two glacial stages have been observed in Alaska by Capps, 144 an earlier 

 one separated from a later by an interglacial interval of long duration, the 



w Op. cit., p. 143 E. 



»« Dawson, Geol. Surv. Can., 1882-84, p. 140 C. 

 '«* Bull. Geol. Soc. Amer., XXVI, p. 159, 1915. 

 '" Journ. Geol., XX1U, pp. 748-756, 1915. 



