128 SURFACE GEOLOGY. 



and cause. Advancing to the south-east we leave the modified drift, but 

 cross a water-shed which is probably lower than the highest of these 

 kames, and thence follow Hersey brook to Smith's pond. A sandy plain, 

 about 50 feet above the pond or 75 feet above the lake, is found on the 

 west side of this brook near its mouth, covering about half a mile square. 

 The shores of this pond, like those of the lake, are almost entirely till or 

 ledge. 



Upper Beech pond, covering perhaps 150 acres and about 300 feet 

 above Lake Winnipiseogee, is situated a mile and a half north-east from 

 the kames last described. Its outlet is to Ossipee lake by Beech river, 

 but only a very slight barrier at its south-west side prevents its flowing 

 to Winnipiseogee lake by Nineteen-mile brook. This barrier consists of 

 a kame, which in its north-west portion is a nearly 

 level plain three or four acres in extent, but for 

 several hundred feet south-east from this it is nar- 

 rowed to a mere ridge. The gravel of the small 

 plain is but slightly water-worn, the rock fragments 



being from a foot to a foot and a half in size. The 

 Fig. 27. — South end of ^ 



Upper Beech Poxd, ridge consists of sand or finer gravel, in which 



WoLFEBOROuGH. fragments larger than six inches are uncommon. 



. ca e, inc i 4 mi e. 'pj^jg ^yholc deposit is bounded by steep slopes both 

 against the pond and on the opposite side. The height of the plain is 

 20 to 30 feet above the pond ; that of the ridge declines to only ten feet, 

 and at its east end to only three feet above the pond, while its south-west 

 slope falls abruptly to 20 or 30 feet below it. Large springs fed from the 

 pond issue at the bottom of this bank. Except at this point and its out- 

 let, this pond is surrounded by high hills ; and no other kame-like deposits 

 occur on its shores or in the steeply sloping valley that descends towards 

 the south-west from this barrier. 



The shores of the lake through Wolfeborough have no modified drift 

 worthy of note. It is next met with in Alton, about a mile east from 

 Fort point and the mouth of Alton bay. Proceeding eastward from the 

 mouth of the bay, we soon come to a hill more than 200 feet high, and at 

 its east side find an area of considerable width, which is only 50 to 60 

 feet above the lake, and extends about two miles from north to south 

 between the lake and the bay at Gerrish point. Where this area is 



