154 GLACIAL GEAV^ELS OF MAINE. 



at the south end of the pass present some very hiteresting developments. 

 The east branch of Greorg-es River (or St. Greorges River, as it is named 

 on many maps) rises in the hills east of Hogback Mountain. It flows 

 westward to the south end of the Hogback Mountain Pass, and then 

 south and east through Montville and Searsmont. A plain of gravel 

 bowlderets and bowlders (all well rounded) extends from the south end 

 of the pass for a half mile down the valley. The material is coarse 

 even to the margins of the plain. Southward in this valley the glacial 

 gravel is scanty and discontinuous for about 2 miles on a down slope of 

 20 to 40 feet per mile, yet at intervals it is found in small masses. It forms 

 a small terrace on the western side of this stream at Center Montville, 

 and, becoming more abundant toward the south, soon spreads out into 

 a rather level plain 2 J miles long and more than 1 mile wide. This is 

 situated not far northwest of North Searsmont. Toward the south the 

 gravel of this plain passes into sand, and this again into clay, which 

 extends continuously down the valley of Greorges River to the sea. This 

 is evidently a marine delta, and seems to terminate the gravel system 

 in that direction. 



We now return to the plain of coarse glacial gravel at the south end 

 of Hogback Mountain Pass. This deposit is somewhat triangular in shape. 

 One apex is at the south end of the pass, another extends down the valley 

 of the east branch of Greorges River, while the third lies in a depression 

 along the southern base of Hogback Mountain, about one-half mile south- 

 west of the first. From the last-named point a narrow plain of glacial 

 gravel and cobbles extends for a short distance southwest along the base 

 of the "mountain." The Muskingum Stream drains the area south of Hog- 

 back Mountain and joins the west branch of Geoi'ges River near South 

 Montville. It has several tributaries, the largest two of which I will call 

 the east and west branches. We have seen that the osar river followed the 

 base of the mountain southwest for a time. By turning to the south and 

 crossing a col only 20 or 30 feet high, it might have flowed south along the 

 east branch of the Muskingum Stream. It actually rejected this pass, and 

 about one-third of a mile farther west turned southward along the valley of 

 the west branch of Muskingum Stream. Within 3 miles it left this valley 

 and went obliquely southwestward over a low divide into the valley of the 

 east branch of the Muskingum Stream, the same valley it could so much 



