100 The Amcricati Geologist. February, i898 
The eastern drift has also been observed at considerable dis- 
tances west of the area described in this paper.* 
The greatest distance over which the boulders in this area 
have been, transported extends one hundred and fifty miles. 
Numerous boulders of anorthosyte are found in the Highland 
moraine and to some distance north of it. They are also 
found in the St. Louis river valley, seventy-five miles west of 
Encampment island in lake Superior. The- anorthosyte 
boulders just mentioned are to be referred to a strip not over 
six miles wide and forty-five miles long between Encamp- 
ment island and Carlton peak on the north shore of lake Su- 
perior, the distinctive lithologic characters of which will be 
mentioned later. 
The drift of the northern ice-lobe does not appear to have 
been transported a great distance. The greater number oi 
boulders are from rocks whose ledges are not over fifty miles 
distant, and for the most part indeed are within twenty or 
thirty miles. It is also a conspicuous feature of this drift 
that in places the moraines are represented entirely by boulder 
ridges. 
GLACIAL STRIDE. 
The direction and locality of the glacial striae in north- 
eastern Minnesota recorded up to 1893 have been tabulated 
by Mr. Upham.f Several important new observations are 
as follows: 
On the rock which forms the outer part of Grand Marais 
harbor are numerous parallel glacial striae and grooves from a 
few feet to fifty feet in length. There are two sets of these 
stri« w'hich cross each other at a small angle. The more 
prominent and numerous striations run about west, the other 
set bears south of west. In a number of places west of Grand 
Marais are found striae which run west, or a little south of 
west. South of the Pigeon river all striations run westerly. 
The directions of the striae in the region included in the 
accompanying map and indicated by arrows, may be briefly 
summarized as follows: South of the Highland and Itasca- 
*Geology of Minnesota, Final Report, vol. II, 1888. Various county 
reports. 
Upham. 22nd Ann. Rpt., 1893, p. 44. 
Spurr. 22nd Ann. Kept., 1893, p. 123. 
tOp. cit., pp. 35-40. 
