BANCEOFT-GEAND LAKE SYSTEM. 93 



a mass of till, and it is possible that before the barrier was eroded the lake 

 stood at a high enough level for the waters to discharge from Farm Cove 

 southeastward. If so, these gravels are joartly, j^erhaps wholly, valley 

 drift. I have not personally explored this series. It is provisionally 

 included among the glacial gravels. 



BANCROFT-GRAND LAKE SYSTEM. 



An osar crosses the Maine Central Railroad about a mile west of 

 Bancroft station. The gravel is somewhat rounded, but not enough to 

 indicate that the ridge extends very far to the north. It has not been 

 explored in that direction, and probably extends only a few miles. With 

 numerous gaps the gravel takes a southeast course across the valley of 

 the Mattawamkeag River, thence over a low divide and obliquely across 

 the valley of Hawkins Brook, then over another low pass into the valley 

 of Hot Brook. It then turns more nearl}^ southward, and near the Hot 

 Brook Lakes it expands into a plain about one-third of a mile wide. Part 

 of this plain has the external appearance of a delta, and was probably 

 deposited in a small glacial lake, such as would naturally form on a north 

 slope. Thence the gravel system goes south along the valley of the east- 

 ern branch of Hot Brook. At the road from Danforth to Prentiss tlie 

 gravel takes the form of a- low osar-plaiu in the bottom of the valley. 

 This has been eroded by the stream into teiTaces, so as to appear like 

 valley drift, but the stones are much more rounded than the till gravel 

 which appears in the beds of small brooks in that part of the State. Cross- 

 ing a divide said to be much less than 200 feet above the Hot Brook Lakes, 

 the gravels turn southeastward over a rolling region to near the northwest- 

 ern angle of Baskahegan Lake. In this part of its course the gravel is 

 somewhat interrupted. It next turns southwestward through Kossuth to 

 Pleasant Lake, crossing the valleys of several streams and as many low 

 divides. In this section it is a two-sided ridge, and is not quite continuous. 

 It would be contrary to general analogy for this long osar stream to have 

 ended so far from the sea as Junior Lake. Rounded gravel, in the form of 

 ridges and terraces, is reported along Junior and Scraggly lakes, which I 

 infer are part of this system. They aijpear only at intervals, and ^^robably 

 a large part of the gravel is beneath the water. The gravels are well 

 developed along the western shore of Grand Lake, and thence they 



