PERU-BUCKFIELD SYSTEM. 211 



two short systems of sidehill kames or eskers. They are situated in small 

 north-and-soiith valleys which descend steeply toward the south. The 

 ridges begin on the hillside, and after descending about 100 feet to rather 

 level ground, they end within a mile in small delta-plains. At their north 

 end the ridges do not have the smooth and arched cross section so common 

 to kame ridges found near the present sea level, but they have the steeper 

 lateral slopes and the irregular heaping characteristic of the lateral moraines 

 of a local or valley glacier. The material has been but little polished by 

 water, yet the finer drift has been washed out of it. The two systems are 

 only about a mile apart. The western system consists of three parallel 

 ridges which become confluent in the terminal plain. 



PERU-BUCKFIELD SYSTEM. 



Worthley Pond, Peru, lies in a narrow valley bordered by steep, high 

 hills. The outlet of the pond flows northeastward into the Androscoggin 

 River at South Peru. South of the pond the valley narrows so as to form 

 an almost V-shaped pass through the high hills which lie not far south of 

 tlae Andi'oscoggin River. The highest part of this pass is situated only a 

 short mile south of Worthley Pond and about 100 feet above it. South of 

 the pond, in the bottom of this narrow valley, are several short ridg'es of 

 sand separated by gaps. Only a small brook flows in the valley, and it is 

 quite incapable of depositing- ridges such as these, in respect either to 

 form or to size. Lying" across this part of the valley, or forming irregular 

 terraces along the lower slopes of the bordering- hills, are numerous piles 

 and heaps of sandy till which have the appearance of moraines of a local 

 glacier. Probably a tongue of ice projected south through the pass in late 

 glacial time and left these m.oraiues during its retreat northward. During 

 the retreat of the ice front down the northern slope, a small lake would 

 naturally form between the ice and the hill to the south. The drainage of 

 the local glacier would pour into this small lake and then overflow south- 

 ward over the col. If a large stream flowed into such a lake, the whole 

 valley ought to be deeply covered by a lake delta. On the contrary, the 

 sand and fine gravel are found in the form of several isolated ridges. This 

 seems to indicate that the sand ridges were deposited by small streams in 

 channels within the ice, and that after the formation of the lake at the ice 

 front there was either little sediment or the drainaa-e flowed northeastward 



