92 GLACIAL GEAVELS OF MAINE. 



appears to be as follows : First, tlie main glacial river flowed on to the sea 

 near Jonesboro. As the ice retreated, a series of small deltas were formed 

 in bays or lakes within the ice. The great delta-plain in T. 25 and in 

 Wesley was formed when the ice had retreated so far up the Machias 

 Valley that the glacial river carried its sediments beyond the ice front into 

 the open sea. Finall}-, when the sea stood at about 230 feet, the ice had 

 melted so far to the northward that a bay of salt water occupied the basin 

 of Big- Lake. The glacial river, now greatly reduced in size, poured into 

 the sea near the northwestern angle of Big Lake, and perhaps subsequently 

 at another point a few miles northward in the Musquash Valley. These 

 apparent deltas near Big Lake may have been deposited in purely glacial 

 lakes, yet they bear a suggestive relation to the old sea-level in the basin 

 of the lake. 



GRAND LAKE OSAR. 



At the foot of the outlet of Grrand (Schoodic) Lake a well-defined osar 

 extends northward into the lake and can be seen for some distance on the 

 floor of the lake. The stones are so well rounded that it seems probable 

 the series extends north or northwest of this point, perhaps to Oxbrook 

 Lake. The ridge extends southward from Grand Lake Stream and joins the 

 main system in the valley of Little River. Not far from the lake the ridge 

 consists of very coarse matter. The large size of the bowlderets and 

 bowlders makes it probable that the ridge was deposited by a subglacial 

 stream. The upper Schoodic Lakes lie in the midst of a granite region 

 which has contributed a great number of stones and bowlders to the drift. 

 The vast quantities of granitic drift contained in the great gravel plains of 

 Hancock and Washington counties came chiefly from the long outcrop of 

 granite which extends from Orland on Penobscot Bay with but few inter- 

 ruptions through New Brunswick to Chaleur Bay. 



FARM COVE GRAVELS. 



Farm Cove is a deeply reentering bay on the south shore of Grrand 

 Lake. From the head of the cove a low pass extends southeastward, 

 bordered by high hills. The highest point of the pass rises but a few feet 

 above Grand Lake, and within less than a mile from the lake a branch of 

 Little River takes its origin and flows southeastward. Water- washed gravel 

 is reported in this valley. The present outlet of Grand Lake is cut through 



