250 GLACIAL GRAVELS OF MAINE. 



3. There were two overflows, each more than one-eighth of a mile 

 wide, from the Androscoggin Valley in Bethel southward through Albany 

 and down the Crooked River Valley. These took place after the ice had 

 melted over the broad Bethel intervale, and apparently over the Crooked 

 River Valley also. Their waters probably deposited most of their sedi- 

 ments before flowing over the col in Albany. As these Androscoggin 

 waters, rushed down the valley they would more or less wash away and 

 reclassify the glacial gravel previously deposited. 



It thus becomes specially difficult to determine whether the plain of 

 finer sediments that borders the ridges which rise a few feet above the rest 

 of the plain is osar-plain or valley drift or both. The ridges were without 

 doubt deposited in narrow channels within ice walls. From general analogy 

 it is probable that the original cliannel broadened and that an osar-plain 

 was laid down in the broad channel, and that this was subsequently acted 

 uiDon by river floods and covered by some valley drift. 



At North Waterford the Crooked River turns abruptly eastward, and 

 for several miles it is bordered by erosion terraces of gravel and well- 

 rounded cobbles. Apparently a continuous plain one-eighth to more than 

 one-fourth mile wide once extended across the whole valley. In the eastern 

 part of Waterford the river again turns a right angle and flows southward. 

 The valley here widens for 2 or 3 miles, but the gravel plain does not 

 broaden correspondingly. It takes the form of a plain three-fourths of a 

 mile wide and about twice as long, situated on the west side of the river. 

 At the north it consists chiefly of coarse gravel, cobbles, and bowlderets, 

 all very much rounded. Although rather level on the top, the plain incloses 

 Papoose Pond and several kettleholes. Toward the south it becomes some- 

 what finer in composition, yet it ends in gravel which contains some cob- 

 bles and large pebbles. It can not, therefore, be a delta deposited in a 

 large body of still water. Along the eastern side of this gravel plain and 

 for several miles below this point the valley of Crooked River is covered 

 by a plain of sand one-eighth to one-third of a mile wide. This is often 

 very fine and silty, and sometimes contains a little angular gravel near the 

 stream, the result of the erosion of the till. The contrast in shape between 

 this gravel and that contained in the present bed of the stream as compared 

 with the very round stones of the gravel plain that extends from North 



