90 SURFACE GEOLOGY. 



necticut kame, and interstratified with sand, but more commonly very 

 coarse, as is characteristic of this series. Other portions are unmodified, 

 containing angular stones ; and large boulders are occasionally found. 

 Three long hollows, varying from 30 to 50 feet in depth, one being wholly 

 enclosed, lie between these kames for a half mile at their north end, be- 

 yond which the hollows have been filled with fine alluvium, producing 

 a nearly level plain. Southward, many irregular long hollows are found, 

 one of which contains a pond. An ancient channel, occupied by the 

 whole or a part of the Merrimack when it first began to excavate its 

 highest plain, extends along the south-east side of this area of kames. 

 Rock Rimmon lies a quarter of a mile farther south-east, and the exten- 

 sive plain around it is destitute of kames. 



This series makes almost a right angle where it is crossed by the Pis- 

 cataquog river, nearly two miles above its mouth, and turns south-east 

 for a mile, consisting of a single ridge of water-worn gravel, which lies 

 near and parallel to the river. It is well exposed at this angle by excava- 

 tion for the Manchester & North Weare Railroad a short distance west 

 of its bridge. An exploration of the Piscataquog valley for two miles 

 farther west showed high and low terraces of fine alluvium, but no kame- 

 like deposits. The south-east course of the kame with this river would 

 have led to the conclusion that its origin was from this tributary valley, 

 had not the whole series been traced and found at other places as here 

 closely following the west side of the Merrimack valley. 



Near Piscataquog village the course of the series turns to the south, 

 crossing the New Boston road about an eighth of a mile east of the cem- 

 etery. This road passes through a gap in the principal ridge, which both 

 on the north and south is filled almost as compactly as possible with 

 angular fragments of rock one or two feet in size. Through this gap a 

 portion of the river formerly flowed, and its ancient channel extends a 

 mile to the south, lying on the west side of the kame. South-east from 

 this gap, and east of the coarse ridge of angular materials, we find a small 

 plateau, which belongs to this series, and is composed of well-rounded 

 gravel, the largest pebbles having a diameter of two feet. A thin cover- 

 ing of sand forms the surface here, but excavations show the coarse 

 gravel, which is prepared by screening for the manufacture of concrete 

 pavement. This series terminates within a half mile to the south. After 



