86 SURFACE GEOLOGY. 



son's mill in Concord. For a fourth of a mile north from this mill, and five 

 and a half miles southward along the Soucook to its mouth, these ridges 

 have been carefully traced, and are found well developed, rising 40 to 100 

 feet above the river, and nearly continuous, sometimes single, and again 

 two or three parallel and of equal height. These kames, for the first three 

 miles, lie close to the river, almost wholly on its west side. The material 

 is prevailingly very coarse, but for the most part plainly water-worn, with 

 the largest pebbles or rounded boulders two or three feet in diameter, 

 and it occurs in steep, narrow ridges 40 to 75 feet high. The river above 

 Richardson's mill is 307 feet above the sea; hence these kames do not 

 exceed 400, and those west of Loudon are probably about 450 feet above 

 the sea. 



At Clough's mill, three miles above its mouth, the Soucook departs 

 from its general course, crossing the line of kames, and turning with a 

 right angle one mile to the west. Below this point the river does not 

 follow, as before, the eastern border of the plain ; but we find that the 

 kames continue in a nearly straight course close to this east boundary. 

 For a mile and a half from Clough's mill the kame lies on the east side 

 of the road. In the first half mile of this distance we find a single steep, 

 narrow ridge of coarse, water-worn gravel, 20 to 40 feet above the adjoin- 

 ing plain. Sections of this ridge are exposed by the river at Clough's 

 mill, and by a cut across it for a new road at a short distance south. In 

 the next mile we find the same coarse gravel, lying partly in the form of 

 a ridge, but not so prominently, and partly in a somewhat irregular ter- 

 race. 



One mile above the mouth of the Soucook, where it comes near the 

 highway, a distinct gravel ridge occurs on its east side ; and on its oppo- 

 site side we have two parallel ridges, separated by a hollow, but with the 

 top of the west one the same in height with the adjoining plain. The 

 largest pebbles seen in this ridge were one foot in diameter. Thence 

 for nearly a half mile no kames are found ; but after passing the lowest 

 bridge on this river they are well shown on its east side to the railroad 

 near its mouth, forming a broad ridge of gravel, with pebbles up to a 

 foot and a half in diameter. The direction of this ridge points to the 

 continuation of the series on the opposite side of Merrimack river. 



A fine section of the kame has been exposed by excavation for the rail- 



