yO GLACIAL GEAVELS OP MAINE, 



considerable extent independent of the surface features of the present land, 

 perhaps by the outline of the ice front in the sea off the coast. 



WESLEY-NORTHFIELD SYSTEM. 



Wesley Post-Office is situated on a range of hills about 200 feet high. 

 Along the western base of this hill is a rather low north-and-south valley, 

 in which lies a series of ridges of glacial gravel. The system may have 

 connections northward toward Chain Lake, but I have traced it unmistak- 

 ably only to a point about half a mile southwest of Wesley Post-Office. 

 Beds of apparently water-washed gravel are found about 2 miles west of 

 Wesley, but it is uncertain how much of them is glacial gravel and how 

 much is beach gravel. In view of the doubt, I omit them from the map. 

 The series above described as beginning near Wesley extends southward in 

 a nearly straight line to Lower Seavey Lake, where it turns southwestward 

 and soon spreads into a series of reticulated ridges inclosing kettleholes. 

 Groing southwestward the ridges become broader and the kettleholes more 

 shallow, and it soon appears to be a marine delta-plain. This series is said 

 to connect with the Old Stream series in Centerville and Whitneyville. 



Length, about 15 miles. 



TOPSFIELD-OLD STREAM SYSTEM. 



This important osar system appears to begin not far north of Musquash 

 Lake, in Topsfield. At the road from Topsfield west to Springfield the 

 gravel takes the form of a low terrace on the west side of the outlet of 

 the lake. It consists of well-rounded gravel, and is distinguished from 

 valley di-ift partly by the shape of the stones and partly by appearing on 

 one side of the valley with no corresponding terrace on the other side ; and 

 often it takes the form of a two-sided ridge while following the valley of 

 Musquash Stream. It is somewhat discontinuous, and for part of its course 

 takes the form of an osar-plain that once extended across the valley, but is 

 now deeply eroded into terraces by the stream. The material is rather fine, 

 and the size of the deposit is in general not very large. In the southern 

 part of the valley of Musquash Stream it becomes a ridge 20 to 40 feet 

 high, with moderately steep lateral slopes. For several miles in the midst 

 of a low level region it rises above the swamps like a railroad grading. 

 The matter here is coarser, and many cobbles and large pebbles appear, all 

 well rounded. A short distance west of where Musquash Stream empties 



