Report of the State Geologist. 11 



Ulster counties, together with the Helderberg escarpment, T\hich 

 it is very desirable to publish for the full illustration of the geol- 

 ogy and economic resources of these portions of fctate. 



Faulted Region of the Mohawk Valley. 



A paper* entitled "A Preliminary Description of the Faulted 

 Region of Herkimer, Fulton, Montgomery, Saratoga and 

 Adjacent Counties," communicated by Mr. N. H. Darton with 

 this report, will give information in deta;l of this region of 

 countr}^, which was originally described by Mr. Yanuxem in his 

 reporb on the Ge logy of the Third District. The paper by Mr. 

 Darton is the result of work done in the field during the season 

 of 1893, as a part of the work preparatory for the geologic map 

 of the State. The results of this work, and of all his other 

 field work up to i 8.4, have already been transferred to the 

 geologic map which is being prepared for publication by the 

 U. S. Geological ^urvey in Washingtoti. 



This paper gives an account of the general relations of the 

 faults, and describes in detail those at Little Falls, on the East 

 Canada Creek, St. Johnsville, the Noses, Fonda, Tribes Hill, 

 Broadalbin, Hoffman's Ferry, Saratoga and Lake George. Some 

 of these had been previously described by Yanuxem in his 

 Report on the Third Geological District, but are here discussed 

 at much greater length. This region of country was explored 

 by the writer and Prof. W. J. McGee, of the U S. Geo- 

 logical Survey, in the autumn of 1884, and the field notes of 

 these investigations, combined with farther observations by Mr. 

 C. E. Beecher and Mr. C. E. Hall, were incorporated in the Report 

 of the State Geologist for 1885 m a paper of three pages, accom- 

 panied by a map of the Mohawk Yalley. This paper is here 

 inserted as a note to show the state of our knowledge previous 

 to the work of 189J.t 



The region is a general monocline, with sediments of slightly 

 varying dip, and the faults traversing this monocline, accom- 

 panied by certain features of local disturbance, have considerably 

 modified its regularity. As a rule these displacements do not 

 make conspicuous features in the topography, but one of them, 



* Being accompanied bj' a colored map which could not be published at that time, this paper was 

 deferred till the present report. 

 + See note at end of this paper. 



