96 GLACIAL GEAVELS OF MAINE. 



extends soutli for several miles along the west side of the Seboois River 

 to the road leading from Patten northwestward to Seboois farm and Cham- 

 berlin Lake. It is here in a valley of natural di-ainage continuous (by the 

 Seboois and Penobscot rivers) all the way to the sea. But the osar leaves 

 this open valley and turns abruptly eastward. The road just mentioned is 

 made on top of the osar for a half mile or more, when the road turns 

 southward while the ridge keeps on eastward, up the valley of Hot Brook, 

 then over a low divide, and down the valley of Hay Brook, to Upper Shin 

 Pond. Here it rejected another slope of natural drainage, crossed the 

 pond, and then went over a low divide into the valley of Peasley Brook. 

 It then turns south and follows the valley of this brook to its junction with 

 Fish Stream, about 1 mile west of Patten. In this valley the gravel takes 

 the form of an osar-plain, extending across the valley or forming a flattish- 

 topped teiTace on one side. From near the junction of Peasley Brook and 

 Fish Stream a low valley extends for several miles southward, cut off on 

 the south by hills about 200 feet high. Rejecting this valley, the osar 

 river turned nearly a right angle eastward, and for several miles follows 

 the valley of Fish Stream. Its course lay through Patten Village, but 

 there is a short gap in the gravel deposits at that place, so that a traveler 

 on the north-aud-south road sees no signs of the system. About 4 

 miles east of Patten, in Crystal, the gravel (here in the form of a two-sided 

 ridge) turns another right angle quite abruptly and goes south and south- 

 west across the 1,000-acre bog. This bog lies near the top of the low and 

 level divide between the waters of Fish Stream, flowing north and east 

 into the west branch of the Mattawamkeag at Island Falls, and those of 

 the Molunkus River, flowing south. Here the gravel takes the form of low 

 bars and narrow osar-plains, flanked and often nearly covered by peat and 

 water. The drift of the upper Molunkus Valley merits study. No two- 

 sided ridges appeared at the places examined by me, but the river is 

 bordered by low terraces which have the form of erosion terraces of 

 ordinary valle}^ di'ift. An inspection shows that the stones of this gravel 

 are all well rounded, much more so than the ordinary stream gravel in 

 that part of the State. We know, too, that a large glacial river flowed 

 into the upper end of this vallej?-, and it is also certain that such a river 

 flowed in the southern part of the valley. The river therefore must have 

 flowed the whole length of the valley. But the only water-washed gravel 



