140 GLACIAL GRAVELS OF MAINE. 



Railroad, to Plymouth Village. The road from East Newport to Plymouth 

 is made on top of the ridge for several miles. Just north of Plymouth 

 Village the road crosses a hill about 125 feet high. The gravel system 

 here bends to the east of the road for a short distance and crosses the hill 

 at an eleA^ation about 50 feet lower than the road. At the northern base 

 of this hill there is a plain of gravel with much sand. The plain is near 

 one-fourth of a mile wide, and indicates a checking of the glacial streams 

 north of the hill. From East Newport to this point the osar traverses 

 a plain that is covered by sedimentary clay — border clay. We have seen 

 that the osar river turned east in order to cross the hill north of Plymouth 

 at a low part of the hill, but by bending about the same distance west 

 the stream could have flowed around the hill along a valley of natural 

 drainage. The gravel is scanty on top of the hill, but becomes abundant 

 near its southern base in the outskirts of Plymouth Village. The ridge 

 next crosses Pl3^mouth Pond, plainly showing as a natural roadway extend- 

 ing across the valley, but it is submerged for a short distance. The road 

 is made on top of this natural embankment while crossing the pond and 

 bordering swamp. The system now begins to ascend a hill 100 feet high, 

 and at once expands into a plexus of broad, rather parallel ridges inclosing' 

 several kettleholes. Approaching the top of the hill, the several ridges 

 coalesce into a flat-topped plain near one-eighth mile wide. It is com- 

 posed chiefly of sand, and is a fair type of the broad osar. No gravel is 

 found on the top of the hill for a short distance; then it begins again and 

 continues down the hill to North Dixmont. It here takes the form of a 

 narrow ridge 50 to 75 feet high, having steep lateral slopes. In several 

 exposures the strata, as shown in cross section of the ridge, dip mono- 

 clinally eastward, as if the channel in the ice enlarged on the east side 

 toward the open valley. The ground rises to the west, and this makes it 

 a possible hypothesis that the ice flowed eastward enough to compensate 

 for the natural enlargement of the channel westward. 



Going southward, we find the ridge growing broader and lower, and it 

 finally spreads out into a rather level plain one-eighth of a mile wide. This 

 becomes finer in composition toward the south, and finally becomes sand. 

 It is bordered at the sides and south end by a rather steep bluff, which 

 overlooks the valley of Martin Stream. This is a small stream which rises 

 in Troy, then flows northeastward through Dixmont, when it turns north- 



