GEOLOGICAL SURVEY OF THE STATE OF NEW YORK! 



(GEOLOGIC MAP.) 



k Preliminary Description of the Faulted Region of Herkimer, 

 Fulton, Montgomery and Saratoga Counties. 



By N. H. DARTON. 



Contents : Introductory. General Relations. Faults. ~ Little FalU 

 fault, Faults on East Canada Creek, St. Johnsville faults, The '' Noses'' 

 fault, Fonda fault, Tribes Hill fault, BroadalUn fault, Hoffman's Ferry 

 fault, Saratoga faults. Lake George faults. 



Introductory. 



This report is an account of studies made during the summer of 

 1893 of the relations of the faulted Lower Silurian and Cambrian 

 members in eastern Central New York. The primary purpose 

 of the work was to determine the distribution of the forma- 

 tions for the recently published geologic map of the State, but 

 data were also obtained bearing on the relations of the faults, 

 and the stratigraphy. 



The principal faults cross the Mohawk ri^er between Schenec- 

 tady and Little Falls. These faults appear first in the Utica 

 slate at no great distance south of the river and extend north- 

 ward with a gradually increasing throw, bringing up the Trenton, 

 Calciferous and crystalline rocks. Several of them continue into 

 the Adirondacks. 



Yanuxem- described the principal features of the faults in the 

 immediate vicinity of the Mohawk river, but gave little informa- 

 tion regarding their northern extension. On the New York 

 geologic map of 1842, some of the more general effects of these 

 faults are represented, but their nature was not indicated Some 

 further light was thrown on the relations along the Mohawk 



■ ♦Geology of \ewYork, Part III, comprising the Survey of the Third Geological District, 1842. 

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