LOCALITIES OF SUPERPOSITION. 195 



CHAPTER VI. 



Localities of the superposition of the different Rocks of the preceding Chapters, toith 

 the exception of some of the upper ones, illustrated by wood-cuts. 



The subject matter of this chapter — and especially its wood-cuts, which exhibit the actual 

 superpositions, where best seen, of the different rocks and groups, with the above exceptions, 

 which belong to the district — would have been of more advantage to the Report, had it been 

 incorporated with the parts which it is intended to illustrate. This no doubt would have been 

 done, had sufficient time been taken to mature the whole plan ; but the desire to finish the 

 work has been too strong, and knowing that if it first appeared, it would be followed by the 

 three other parts or reports of the other districts, so that whatever was omitted would be 

 suppUed, and if a better arrangement could be pursued, it would be followed. It must be 

 borne in mind that these reports are but the reports of districts, and not of the whole State ; 

 the object of which, as contemplated in the plan of the survey, was to furnish materials for a 

 work of the kind ; and therefore the same finish of character could hardly be expected of them, 

 though, if given, it would greatly add to their value on their ovra account, and to their utihty 

 in the preparation of a Final Report for the whole State. 



In the ascending order, the first systems as to superposition, are the Primary and Taconic, 

 which will be dismissed in a few words. Properly speaking, there is no member of the Taconic 

 system in the third district, but ■partial products only, as stated in the fourth chapter of this 

 report, but misprinted particular. These are found on the northern slope of the Primary, 

 and there only in this district, and have been fully spoken of under the head of the system, 

 and will again be adverted to in the chapter on the counties, under the head of Lewis county. 

 The Taconic system is but a nominal one in the district, though not so on the eastern border 

 of the State. The next in order will be the New-York system, constituting the all important 

 portion of the district. 



The most satisfactory connection between the Primary and the New- York system, is best 

 seen along the Mohawk, at the upraised hills of the gaps of the Noses and of Little falls, 

 especially at the latter, for there the primary forms the base or surface rock of the whole of the 

 gap through which the Mohawk flows, whilst at the Noses it appears only at the east end. 

 The connection at either locality of these upraised masses, which show the two systems, is 



