SYSTEMS OF GLACIAL GRAVELS. 117 



ment it deposited, it was probably not so large as the Seboois-Medway- 

 Enfield branch. It drained the region directly south of Mount Katahdin, 

 and it is an open question whether it ought not to be known as the Katah- 

 din osar. It is even more inaccessible than the Enfield branch. 

 Length, 50 or more miles from Greenbush northward. 



SOPEB BROOK GRAVELS. 



A ridge, probably of glacial gravel, is found along Soper Brook, north 

 of Ripogenus Lake, in T. 4, R. 11, Piscataquis County. It is about 2 miles 

 long, and is possibly a branch of the Katahdin system. 



NOTE ON THE UPPER PENOBSCOT VALLEY. 



I have not had opportunity to explore this valley above the Twin 

 Lakes. On comparing the map of the upper Penobscot region with the 

 country lying east and Avest of it, symmetry is seen to demand that the 

 glacial gravels should extend farther north and west than is shown on 

 the map. Probably the osars are there, but have not been discovered and 

 reported. The hilly region about Katahdin can not be judged by the anal- 

 ogy of the level areas, but to the west a more level country is found, 

 where glacial gravels may be expected. 



EASTBROOK-SULLIVAN SYSTEM. 



This rather short system extends from the south end of Webbs Pond, 

 Eastbrook, southeastward through Franklin and Sullivan. It traverses a 

 rolHng plain along valleys or over low hills, and lies wholly within the area 

 that was beneath the sea. It crosses the Shore or Telegraph road, and then 

 continues southward as a high, broad ridge of coarse gravel, cobbles, and 

 bowlderets. At the east end of Hog Bay it turns abruptly eastward and 

 goes up a narrow valley. It is said to continue for several miles in this 

 direction and to end near Flanders Pond, in the northeast part of SulHvan. 



MINOR GRAVEL SERIES. 



These were probably deposited by different glacial streams. 



Amherst delta. — A Small, ratlicr level-topped plain of sand and gravel is found 

 on the Air Line road, about 3 miles west of Amherst Post-Office, at the south- 

 ern base of a high range of granitic hills. Going south of the road the 

 sediments become finer. The gravel passes by degrees into sand, and this 



