46 NEW YORK STATE MUSEUM 



marked for the whole distance almost without a break as a high, 

 steep, nearly straight eroded scarp from a few hundred feet to more 

 than a thousand feet high with its strike nearly at right angles to the 

 foliation of the granite (see map and plate 8A). The eastern fault 

 also extends along the base of a conspicuous scarp, but it averages 

 considerably lower than the other scarp. Just north of where the 

 county line crosses the fault a diabase dike cuts the gabbro and 

 both rocks are highly crushed and broken due to the faulting. The 

 crush-zone shows a strike of north 25 degrees east. The topo- 

 graphic evidence indicates that the block iDCtween these faults sank 

 the most toward its middle, or fully 1000 feet, in relation to the 

 West mountain mass, and a few hundred feet in relation to the 

 Hadley hill mass. 



There is strong topographic evidence for the presence of a fault 

 several miles long with northeast-southwest strike as mapped, cross- 

 ing the river east of Conklingville. The nearly straight ridge with 

 steep eastern front hundreds of feet high, cut through by the river, 

 marks the upthrow side. The belief that this is really a fault scarp 

 is greatly strengthened by the fact that it strikes across the foliation 

 of the rocks. Glacial drift everywhere conceals the actual fracture. 



High steep ledges forming the eastern boundary of the area of 

 gabbro-granite mixed rocks lYz miles northwest of Corinth no 

 doubt mark the northern extension of the long conspicuous fault 

 of the Saratoga quadrangle. 



The only notable fault mapped v/ith northwest-southeast strike 

 lies along the southwestern base of Potash mountain and the high 

 mountain next to the northwest (see plate i). It seems impossible 

 satisfactorily to account for this bold, unusually high scarp except 

 on the basis of faulting. It is highly improbable that this great 

 scarp resulted from removal of weaker rock such as Grenville, or 

 Grenville-granite mixed rocks, first, because not a vestige of such 

 rocks is now visible and, second, because the scarp trends at a high 

 angle across the strike of the granite. As already pointed out, 

 bodies of Grenville or Grenville-granite mixed rocks, almost invari- 

 ably lie in the granite parallel to its foliation, and removal of such 

 rocks by erosion would therefore leave a scarp parallel to the 

 granite foliation. 



The other faults mapped along the northern side of the quad- 

 rangle are southward extensions of North Creek quadrangle faults 

 and they require no special descriptions. Careful search failed to 

 reveal any evidence for faulting either through the deep narrow 



