244 IRVING B. CROSBY 



On the lower course of Crooked River there are several low- 

 falls. The valley is filled with drift and in meandering across this 

 drift plain the stream has discovered the ledges that now break 

 its bed. The old river was probably free from falls. 



At several places, in its upper part, the valley is rather narrow, 

 but in estimating the size of valley required by the Sebago River 

 it must be remembered that the upper Androscoggin was then 

 tributary to the Connecticut, and the river below Bethel was 

 smaller than the present Androscoggin. It follows that the 

 narrow places which are in the mountains were ample for the 

 Sebago River. 



In the town of Albany, at the place marked L on Figure i, 

 granite bed rock outcrops in the stream at an altitude of 6io feet. 

 The grade of the Sebago River from this point to Bethel was 3 feet 

 per mile or the same as the present grade of the Androscoggin 

 above Bethel. 



The entire valley of Crooked River has been carefully studied 

 with regard to narrow places, sharp bends, and elevation of bed 

 rock, and nothing has been found tending to disprove the belief 

 that this was the course of a large river. 



There are four passes between the headwaters of Crooked River 

 and the Androscoggin, marked F, G, H, and / on Figure 5. The 

 lowest pass {F on Fig. 5) is a mile north of the head of Songo Pond. 

 Its summit elevation is 670 feet or only 35 feet above the Andros- 

 coggin. The pass is broad, fiat, and swampy, and no ledge is 

 visible in the pass or on its slopes; there is nothing to indicate 

 bed rock near the surface, and therefore this pass is believed to be 

 the drift-filled valley of the old river. Songo Pond is reported 

 to be 40 feet deep, which places its bottom 25 feet below the Andros- 

 coggin and gives further evidence of a buried valley. The other 

 passes are higher and will therefore not be considered further. 



Profile 3 (Fig. 2) shows the grade of the Sebago River from 

 Bethel to the sea. The full line represents the present surface, 

 and where the old river course is now buried, its probable grade 

 is shown by a broken line. A comparison of the profile of the 

 Sebago River with that of the present Androscoggin (Profile i) 

 shows that the present river has a series of stretches with very 



