THE HILLSBOBO BEACH. 451 



feet, fntm which its eastern slcjpe descends 10 feet and its western slope 

 about 5 feet. This part of the Maple Ridge was accumulated by Lake 

 Agassiz at the stage of the Hillsboro beach, rising then only 2 or 3 feet 

 above the level of the lake. f"ollowing the ridge onward 9 miles farther to 

 the northeast and east, it is found to become broadei' and less detinite, and 

 its height sinks slowly about 20 feet to 900 or 895 feet in the south edge of 

 section 13, Raymond, about a quarter of a mile north of the Maple River, 

 where it ceases to be traceable even as a slight swell above the general 

 level of the surrounding expanse of lacvistrine and alluvial silt. Shore 

 currents appear to have come together from both the north and south along 

 this curved spit while the Blauchard and Hillsboro beaches were being 

 accumulated and during the fall of the lake surface below each of these 

 stages. 



From the vicinity of Greene the Hillsboro shore-line runs northward 

 50 miles, passing about 3 miles west of Grandin and Kelso, 1^ miles west 

 of Hillsboro, about three-fourths of a mile east of Cummings, and 1 mile 

 west of Buxton. (Opposite to Grandin and Kelso it is marked by a typical 

 gravel and sand ridge, with slopes descending 10 feet on the east and 5 or 

 6 feet on the west to the adjoining surface of till. Mr. R. T. Kingman's 

 house, west of Hillsboro and close south of the Goose River, is built on 

 the crest of the Hillsboro beach ridge of g-ravel and sand, at an elevation of 

 about 920 feet above the sea. The slopes of this beach fall about 15 feet 

 toward the east and 5 feet westward. Within a quarter of a mile farther 

 west, an escarpment of till rises 10 feet, from 915 to 925 feet, approxi- 

 mately, having been cut by the waves of the lake when it stood a few feet 

 above its later level by which the beach ridge was deposited. One and a 

 half miles south of Mr. Kingman's the Hillsboro shore has no beach deposit, 

 being indicated only by an escarpment of till which rises 6 to 1 feet within 

 a distance of 15 to 20 rods from east to west. 



A slightly highei' shore-line, marked by an escarpment 6 to 8 feet liigh, 

 eroded in fine silt, was observed a mile west of each of these localities, being 

 thus traced about 2 miles southward from the Goose River. 



Three pauses in the crustal iq:)lift are thus shown near Hillsboro by 

 the former levels of Lake Agassiz, approximately at 925 or 928 feet, 920 



