134 SURFACE GEOLOGY. 



two places are only a few feet higher than that near the Pavilion. Nearly 

 all that part of the village which lies south-east from the bridge is built 

 on a thick mass of till, which encloses a continuous stratum of clay. 

 North-east from the Pavilion a slope descends in about twenty-five rods 

 to a small pond, which is tributary to the lake and of the same height. 

 This slope has a surface of till, with numerous boulders ; but excavations 

 for brick-making show that the clay beneath has a thickness of fully 20 

 feet, with its bottom resting on till only a few feet above the lake. The 

 till on the surface is i to 8 feet deep. This clay is free from pebbles, and 

 is finely laminated in its lower portion, while its upper part sometimes 

 crumbles into small angular pieces. No deposits of clay appear to occur 

 in the thinner till which covers the hillside north-west from the bridge. 



At Clay point in Alton, three miles south-west from Wolfeborough, 

 the lake shore rises steeply from 10 to 40 feet, and from the top of this 

 escarpment the surface, which is coarse till, has a very gentle upward 

 slope. The lower part of this bank consists of a stratum of clay which 

 was worked forty years ago for brick-making. This was at the end of the 



point where there 



was at least fifteen 



yift-^r.'^i'^^<-:^^.~ Upper till. feet, and perhaps 



more. cousidcrably more, 



Gravel, 2 feet. 



Lower till. of fiucly laminated 



Fi„- 01 Fio- o-. blue clay free from 



Map and Section of Clay Point, Alton. Scale of map, pebbles, with its 



I inch=:J mile. Contour lines are shown for each lo feet ^Qt-tQ^i nearlv at 



above the lake. 



the level of the 



lake. It was underlaid by a stratum of coarse, water-worn gravel, con- 

 taining iron-rust. This abrupt bank, which extends around the point 

 fully a quarter of a mile, has resulted from the excavation of the clay 

 by the waves of the lake. 



Near East Alton, two miles south-east from this point, a bed of 

 gravelly and somewhat stony clay, at least seven feet in thickness, is 

 overlaid by two or three feet of till at a height of about 200 feet above 

 the lake. A mile and a half west from this jolace, clay of good qualit}^, 

 finely laminated and free from pebbles, occurs on the north and north- 

 west side of a hill, at a height of 150 feet above the lake. Both these 



