HERMAN BEACHES NORTH OF LARIMORE. 347 



and the ciist edoe of section 27, Agnes, with a nearly level top of several 

 acres, at 1,182 to 1,190 feet. An aboriginal burial mound, raised 4 feet 

 and having a diameter oi about 50 feet, is situated on the highest part of 

 this area. Such localities, overlooking an extensive and beautiful pano- 

 rama, were frequently chosen for this use, as is shown by many mounds 

 on hilltops and on the margin of bluffs bordering deeply eroded valleys 

 throughout the Northwest. 



North of this island the upper Hennan beach is represented in the 

 east part of the southeast quai'ter of section 22 and in the west half of 

 the southwest quarter of section 23, Agnes, by a wide tract of gravel and 

 sand deposits, in irregular ridges and swells rising 4 to 8 feet, mostly 

 trending from north to south, Avith their crests at 1,164 to 1,170 feet. Next 

 to the north it is a well-defined beach ridge, with crest rising from 1,163 to 

 1,1G8 feet in its coiu'se of a lialf mile from south to north through the east 

 edge of the northeast quarter of section 22. 



In the southeast quarter of section 15, Agnes, the plain that descends 

 slowly toward the Red Eiver on the east is divided from the Elk Valley on 

 the west by a low swell of till, having an elevation of 1,157 to 1,160 feet, 

 destitute of beach deposits. This is succeeded in the north part of this 

 section and the south part of section 10 by a second island which rose 

 above the highest level of the glacial lake, having a length of 1 mile from 

 south to north and averaging a quarter of a mile wide, its elevation in the 

 southwest (piarter of the northeast (piarter of section 15 being about 1,187 

 feet, on the line between these sections about 1,175 feet, and near the cen- 

 ter of section 10, at the north end of this irregular ridge, about 1,180 feet. 

 Its material is till, ])nrtiallv oversj)read in its south half by gravel, which 

 seems to have been brought by the currents and waves of Lake Agassiz 

 from the erosion of its northern portion. 



The l)each of Lake Agassiz during its highest stage extends north 

 from the north end of this island into the southwest quarter of section 3, 

 Agnes, where it is a ridge about 20 rods wide, with an elevation of 1,165 

 to 1,172 feet, composed of coarse gravel and sand, inclosing plentiful rock 

 fragments, chiefly granitic, up to 6 inches in diameter, most of whicli are 

 only ver}' slightly waterworn. Its eastern slope descends 15 to 20 feet in 



