296 SURFACE GEOLOGY. 



pond ; three more west of Crooked pond, near a saw-mill ; and four were noted near 

 together south-east of Clough pond. Others are scattered here and there through these 

 towns and the south half of Canterbury. The most elevated of these bunches of till 

 lie on the north-east slope of Garvin's hill in Chichester, near its top, and similarly on 

 Oak hill in Loudon, both of which are principally ledge. For a third of a mile next 

 above Webster's mills in Chichester, the Suncook river has cut its channel fully 75 feet 

 deep through an accumulation of till, which appears to have rested against a ledgy hill 

 on the south-east. This till forms bluffs that rise very steeply from the river on its 

 north-west side. The finest development of lenticular hills seen in this county is in 

 Concord, north-east of Snow pond, where a group of seven or eight is included within 

 half a mile square. At a mile and a half to the north-west, another example with a 

 double summit is crossed by the north line of this township. 



West of the Merrimack river. Horse hill in the north-west corner of Concord, and 

 several smaller rounded masses at its south-east foot ; Beech hill, at the east line of 

 Hopkinton, at least on its slopes both to the north and south ; the massive north slope 

 of Putney hill, well seen from Contoocookville ; Gage's hill, one mile west of Hopkin- 

 ton village ; several small accumulations in Dunbarton ; and Gove's hill, north of 

 Gove's pond in Henniker, belong to this class. In Webster, till forms deep accumu- 

 lations sloping to the north, at Corser Hill village ; west of Long pond ; and on the 

 north side of Little's hill. Glitten's hill in this town, and Pumpkin and Burnt hills in 

 Warner, are very massive hills of typical lenticular form. They have outcropping 

 ledges at their tops, while their slopes on all sides are composed of till. In Salisbury 

 till forms the south-east slope of Lovering's hill, and the gentle swells upon which the 

 south and central villages are built. In Andover it is prominently massed in south- 

 ward slopes west of Highland lake. Its most notable accumulation in the west part of 

 this county is at New London village, where it forms a broad rounded swell nearly a 

 mile long. The trend of these deposits in Merrimack county is generally north-west 

 to south-east, varying in Canterbury, the west part of Loudon, the north-east part of 

 Concord, and in Dunbarton to a course more nearly north and south. 



Hillsborough Comity. The north-west and south-east portions of this county are 

 nearly or quite destitute of any lenticular masses of glacial drift. They are, however, 

 .sprinkled very abundantly over a central area ten to fifteen miles wide, which extends 

 across the county from north-east to south-west, being connected beyond its limits 

 with the conspicuous development of these hills already described in Dublin, Jaffrey, 

 and Rindge. 



Beginning at the north-east, we find a very remarkable group of lenticular hills, 

 about twenty in number, north of the principal village in Goffstown. Two prominent 

 examples occur a mile east from these, but no others were observed in this whole town- 

 ship. Five miles to the west these hills are again well displayed in the south part of 

 Weare. The massive south-east slope of Dearborn's hill, and the top of Chevy's hill, 

 which lies north-west of Clinton Grove, are also till. In the latter case it forms a 

 rounded mass crowning a high ledgy hill, while scarcely any other lenticular accumula- 



