298 SURFACE GEOLOGY. 



outline 150 feet above the lowland or valleys which surround it on every side. Another 

 of similar height, but less typical in form, lies one mile south-east, near Gonic village. 

 Two of these in Rochester occur east of the Cochecho, being Haven hill crossed by 

 the road to Great Falls, and Gonic hill a half mile south. The former is less steep and 

 prominent than usual, but was shov/n by a well at its top to be composed of glacial 

 drift at least forty feet deep. 



Green hill in Barrington is principally till in three lenticular masses, but ledge occurs 

 at its north-west summit. Dover has two prominent lenticular hills, neither of them 

 typical in form. Long hill represents one extreme, being more elongated than usual, 

 with the nearly north-west to south-east trend which prevails in this county ; and Gar- 

 rison hill, which rises steeply about 150 feet, is at the opposite extreme, being nearly 

 round. Farther south, the only lenticular accumulation of till seen in this county is 

 Wednesday hill in Lee. This is a good example of these hills, rising 75 feet above the 

 land on all sides. Its nearest neighbors of the same class are Bald and Grapevine hills 

 in Newmarket, five miles distant. 



The towns of Maine which border this county on the south-east similarly contain 

 scattered lenticular hills, of which Butler's hill, close east of South Berwick, and Third 

 and Frost hills in Eliot, are very fine and prominent examples. 



Rockingham County. Deerfield is the only town in the western half of this county 

 which shows frequent lenticular deposits of till. They were noted at about one mile 

 from Deerfield centre towards the north-east, north-west, west, and south-west. At a 

 mile and a half towards the south-east are two fine hills of this kind, with the north 

 summit of Mt. Pawtuckaway one mile farther east. Southward through this part of the 

 county lenticular hills are very rare, the only examples discovered being Waterman's 

 hill in the north part of Derry, a small one a fourth of a mile north-east of West Hamp- 

 stead, one close north-east of Salem depot, and Spicket hill, east of Salem village. The 

 last is very massive, and is associated on the east with the extraordinary development 

 of these hills through the north part of Essex county, Mass. The only other lenticular 

 hills observed west of the Boston & Maine Railroad in Rockingham county are Red 

 Oak hill in Epping, the top of which is till, with its whole south-east slope ; Dimond 

 hill, and several others in the east part of this town ; Grapevine and Bald hills in the 

 south-west corner of Newmarket, the latter a very fine example, 150 feet in height; 

 Deer hill in Brentwood, one mile north-west of Marshall's corner, also typical, about 

 100 feet in height; Beech hill in Exeter; and the several rounded masses of Great hill 

 at the north-east corner of Kingston. 



In Newington, Portsmouth, Rye, and a width of four or five miles next to the ocean 

 southward, these hills are entirely absent, if we except the single instance of Great 

 Boar's Head, described on page 254. Stratham has a few fine examples, as Stratham, 

 Barker's, Bunker, and Rollins hills. Three occur within one mile east of Exeter vil- 

 lage, and others one to two miles farther south-east. In the five miles next to Massa- 

 chusetts line, these deposits of glacial drift are very numerous and massive, being more 

 conspicuous than anywhere else in New Hampshire. They are 100 to 200 feet high. 



