GEORGES EIVER SYSTEM. 147 



ment could have been deposited, except where the larger g-lacial rivers 

 flowed into them. It is possible that some of these lakes left too scanty 

 sediment to be now recognizable. The glacial lakes of central Dixmont, 

 as well as others to be hereafter, named, also the short kames of Plymouth 

 and Troy, seem to be connected phenomena, all pointing to the time when 

 the ice front had retreated a short distance north of the hills. There was 

 probably but little motion of the ice at this time. 



1. A still higher range of east-and-west hills lies only about 30 miles 

 to the north of the Palermo-Dixmont Hills — those lying south of the Pis- 

 cataquis River. These would cut off the southward flow of the ice nearly 

 as soon as the lower hills to the south. Thenceforth there would be no 

 pressure and supply of ice adequate to cause much advance of the ice even 

 over so level a plain as the Sebasticook Valley. 



2. I have been able to find no very noticeable terminal moraines on the 

 northern slopes of the Palermo-Dixmont Hills at the places where I have 

 crossed them, though there are many irregular heaps of till, and these may 

 yet be explained as the best approach to a terminal moraine which can be 

 made by a mass of rather slow ice that is not receiving its moraine stuff on 

 its surface, but from below, and is -gradually retreating. 



3. But that there was some motion is probably proved by the observa- 

 tions at Cooks Corner, Troy, where we seem to have an instance of the ice 

 advancing and obliterating the stratification of the surface portion of a 

 kame.-' 



GEORGES RIVER SYSTEM. 



This is a discontinuous system of short ridges and lenticular hummocks. 

 It begins about 3 miles south of North Searsmont. Tlie gravel here is 

 plainly water assorted, but the stones are only a little polished, retaining 

 their till shapes except at the angles. This indicates that we are near the 

 north end of the system. About IJ miles south of this is another short 

 ridge ; the next one is in the southwest part of Searsmont Village, and from 

 this point the series lies near Georges River all the wa,y to Thomaston. 

 The gravels take the form of ridges one-third of a mile or less in length, 

 and they are more often mere elongated domes or mounds. The intervals 

 are several times as long as the ridges, and are a constant feature of the 



1 For the facts near Sonth Albion, see pages 165 to 167. 



