246 GLACIAL GRAVELS OP MAINE. 



crossed the valley of Breakneck Brook, a small stream whicli flows south- 

 west to West Baldwin. It occupies a valley bordered by high hills through 

 which there is but one pass southward. The glacial river flowed through 

 this pass to East Baldwin over a hill 210 feet by aneroid above the point 

 where it crossed Breakneck Brook, and probably from 250 to 300 feet 

 above Southeast Pond. Up and over such high hills this large glacial river 

 flowed, and it has left us some interesting questions to solve. The gla- 

 cial sediments form a broad osar one-fourth of a mile wide, though some- 

 what narrower in the pass toward East Baldwin. Near the tops of the 

 hills the sediment is scanty. In the valley of Breakneck Brook and toward 

 the base of the south slopes the material is very coarse, while on the north 

 slopes it is sand or fine gravel. The sheet of sand and fine gravel on the 

 north slope of the hill crossed by the system just south of Breakneck Brook 

 has been much eroded by rains, springs, and a small brook, but no forms 

 at all like the horizontal terraces that overlook Southeast Pond have been 

 produced. On this slope there are numerous till-shaped bowlders 2 to 6 

 feet in diameter lying upon and within the sand and fine gravel. One exca- 

 vation at the roadside shows several unpolished bowlders lying upon 8 feet 

 of sand and fine gravel, and the excavation does not reach the bottom of 

 the sand. Evidently we have here substantially the same problem as that 

 concerning the bowlders 2 or 3 miles north, in the sand terraces on the hill 

 south of Southeast Pond, except that the sediment is here somewhat coarser. 

 Approaching East Baldwin this series expands into plains of sand, gravel, 

 and cobbles which are confluent with the other great plains of Baldwin, 

 Standish, Limington, and Hollis. 



TKIBUTABY BRANCHES. 



Three short series of ridges join the main series in the eastern part 

 of Denmark. They were deposited by small streams that carried off" the 

 glacial waters of the broad basin in Denmark and Sweden in which Moose 

 Pond is situated. 



DELTA BRANCHES. 



A delta branch probably left this series near the south end of Great 

 Hancock Pond. At this point a broad deposit of sand and gravel diverged 

 from the main osar-plain and extends for about one-fourth of a mile up a 

 hill toward the south and east. Directly in front is a low pass lying east 



