408 Scientifie Intelligence. 
II. GeoLtoGcy AND MINERALOGY. 
1. Glacial gees of Central North rahe in the Vicinity 
of the Bow a elly. Rivers, Canada; by GE M. Dawson, 
(Geol. Rep. Chas 1882— 84). —The facts here Greabite by Mr. 
Dawson are of great interest in their bearing on the glacial his- 
tory of the continent. e region especially described is just 
north of the United States boundary, between the meridians of 
110° W. and 115° W., and about 15° of longitude west of Winni- 
peg. The surface rocks are of the Cretaceous and Laramie series ; 
and on its eer border, in longitude 115°, the Rocky Moun- 
tain countr mmences and the rocks change to Paleozoic— 
the Carboniferous and Devonian formations overlying the 
Cambrian—without any crystalline rocks. Drift covers the 
whole region, and averages at least 100 feet in thickness. It con- 
aramie. 
beds in the same section we Wolf Island), are 18 feet thick, an 
the upper bowlder clay, having traces of stratification, 40 feet. 
Moraines are also described as occurring along the base of the 
ocky Mountains, and the Bow River valley as holding 4 ge 
of larger size than any sawhers originating in the mountains 0 
the district. 
Mr. Dawson observes also that south of the 49th parallel ee 
country from Fort Benton, on the Missouri alon he MacLe 
trail, is all more or less thick! strewn with Laurentian crratics 
Quar tzyte material from the k abun 
town River, 3,200 to 3,300 feet in elevation above the 7 
uring 424020 feet, "and another 42% 30 x 22, and pase y 
exceeding a thousand tons in wei the 
r. Dawson presents the following views with regard to 
mode of glaciation of the regio 
“Apart from the local ahaciete of the Rocky Mountains, it : 
— that the glaciation has been accomplished by some age" 
stward or southwestward from the Laurentian axis 
Which poviuida the region of the Great Plains to the east. oe 
aah has carried with it great — of Laurentian vallel 
uronian material, which in the vicinity of the 49th para'® 
reaches at its extreme limit a point over 700 miles distant from 
