CONTRIBUTIONS TO THE 



THE MERRIMACK. 



This river is now a continuous stream from its sources to the 

 sea, but there is little doubt that the present valley was once 

 filled with a great chain of lakes, extending from the Winne- 

 pesauke on the north to an indeterminate point to the south, 

 certainly as far as ancient Dunstable. The evidence in support 

 of this view is conclusive and will be considered in detail here- 

 after. Along the course of the river the ancient terraces form 

 a conspicuous feature. 



THE PISCATAQUOG. 



This river enters the Merrimack on the west bank, some two 

 miles below Amoskeag falls. The valley extends in a north- 

 westerly direction, passing to the west of Rock Rimmon. The 

 old terraces on either bank are remarkable. 



BLACK BROOK. ' 



This considerable water-course has its source in the Dunbar- 

 ton hills, twelve miles away, flows southeasterly and enters the 

 Merrimack on the west bank a short distance above Amoskeag 

 falls. The significent relation of this now somewhat reduced 

 stream to our history will become more apparent as the record 

 proceeds. 



COHAS BROOK. 



Aside from a number of inconsiderable brooks and rivulets, 

 this is the only local water-way remaining unnoticed. It is the 

 outlet of Massabesic lake and enters the Merrimack on the east 

 bank, immediately below Goffe's falls. The foregoing, therefore, 

 comprise all the principal water systems properly belonging to 

 the Derryfield map, or which are of importance as relating to 

 our present inquiry. 



