1864 ] 4:53 [Peale. 



Feet. Inchee- 



23 

 24 

 Sandy Bottom, 27 

 33 

 35 



36 6 

 Jersey Mountain Rocks dipping at a steep inclina- 

 tion into the River, . . . . . 38 



31 



38 6 

 33 

 30 



32 6 

 Sand and rocks, 31 6 



33 

 Outside the Gap, Sandy Bottom, ... 37 6 



37 

 36 

 35 

 30 

 The river decreases regularly in depth to the rapids below the 

 Gap. 



Opposite the "Indian Ladder," in a cove near shore, several 

 soundings were made; the greatest depth of water was found to be 

 45 feet. 



Mr. Peale observed that marks of water action were observable on 

 portions of the rock at a considerable elevation above the present 

 bed of the river ; but if the theory of erosion, for the formation of 

 the Gap, be accepted, a difficulty is presented by the depth of the 

 water in the Gap, as shown by the soundings in the foregoing re- 

 cord, and the consequent gentle flow of the current; whilst at the 

 distance of one and a quarter miles above and five hundred yards 

 below the Gap the rapids occur, with insufficient water to float the 

 rafts, which, consequently, are obliged to await the spring and fall 

 freshets. 



The constant rise of gas, observable from the deepest parts of the 

 water, was also adverted to, as having a possible action in the forma- 

 tion of the Gap. 



Remarks on the cause of the gaps and their relation to the 

 general structure were made by Mr. Lesley. 



