72 SURFACE GEOLOGY, 



places on the Pemigewasset and commonly along the Merrimack, we find 

 to be one of the characteristic features of this valley. The modified drift 

 of Campton occurs principally in the upper terrace, which has a normal 

 height of 620 to 575 feet above the sea, or about 70 feet a1)ove the river, 

 and in the interval or present flood-plain. At Livermore falls, near the 

 south line of this township, the river passes through a deep, rocky gorge, 

 with a natural fall of 22 feet. The foot of the falls is 483 feet above the 

 sea. 



In Plymouth and Holderness both the upper terrace and interval are 

 finely shown ; and the extent of the alluvial area, at one point a mile and 

 a half wide, is greater than at any other place on Pemigewasset river. A 

 beautiful interval extends for three miles below the mouth of Baker's 

 river; at the north, mainly on the east, and at the south, on the west side. 

 The broad, high plain belongs to Holderness, being on the east side. 



Baker s River. A wide area of modified drift also lies along Baker's 

 river below Rumney. For most of the way it is widest on the north side, 

 reaching back at the widest place to Loon pond, a mile from the river. 

 This likewise occurs in two heights, terrace-plain and interval, the former 

 40 to 50 feet above the river. The railroad extends over this alluvium 

 nearly six miles in a single straight line. 



The upper terrace, in Holderness, Ashland, and in the north part of 

 Bridgewater, is 570 to 560 feet above the sea, or 100 above the river. 

 Thence in six miles to New Hampton village it descends to 510 feet, or 

 72 above the river. It is best shown along this whole distance on the 

 east side. There is almost always one lower terrace, and sometime sev- 

 eral; but we find only small areas that are overflowed south from the 

 large interval of Plymouth. Deltas higher than the normal upper terrace 

 occur at two places near the north line of Bristol, and at the villages of 

 Ashland and New Hampton. Spectacle pond, in the edge of Meredith, 

 probably has its outlet by a subterranean channel, which extends un- 

 der gravel and sand a mile to the west, appearing near the east edge of 

 New Hampton village in several springs. The largest of these supplies 

 a stream of very cold water two or three feet wide and a foot deep. 

 Gravel ridges or kamcs bordering the Pemigewasset were seen in Ash- 

 land half a mile above the mouth of Squam river, and in Bridgewater at 

 Eastman's falls, four miles farther south. No other deposits of this kind 

 were observed between the townships of Thornton and P'ranklin. 



