GEOLOGY OF THE BROADALBIN QUADRANGLE 



47 



neighborhood of two hundred feet. This fault continues on a 

 north-northeast course across the Saratoga sheet toward Corinth. 

 The throw increases northward until, in the town of Corinth, it 

 reaches a thousand feet or more. 





^^ 



pr , , 



'-•I-'. 1 ■'■ l.'.l.'.l.^ 





sea 



\/ V V \/ 



• >/ »/ 



\/ V f/ \/ V \/ 

 1/ V v/ V v 





Lev8L 









Level. 



Fig. 7, 



■J'i^-JIl 



Fig. 8. 



LlljllJ PREC AM Bf^iC L^GRENIViLLE |Soo| Pot S R A I 



I 1 I LITTLF FALLS t^ T R E N T O )V I I UTlCA, 



FT^ THI 



FRANKFOR- 



SCALE; HOI 



,cA. ■ y* 



Fig. 7 Northwest-southeast section across the Grenville tongue and the Hoffman Ferry fault 

 three-fourths of a mile east of North Galway 



Fig. 8 Section passing through Parks Mill and to a point at the map edge two miles east- 

 southeast of Galway 



GALWAY FAULT NO. I 



According to the geologic map of the Amsterdam quadrangle this 

 important fault is a branch of the Hoffman's Ferry fault. It enters 

 the Broadalbin sheet one and one-fourth miles south of Galway 

 and, after continuing northwesterly for two and one-half miles, 

 leaves the map one and two-thirds miles east of Galway. The 

 upthrow side is on the west. South of Galway Frankfort shales 

 are faulted against upper Little Falls dolomite. Thus the displace- 

 ment must be measured by the combined thickness of Black River- 

 Trenton limestone, black shale, and a small portion of the Frank- 

 fort. In the vicinity of Amsterdam the black shale is from twelve 

 hundred to fourteen hundred feet thick and although it is probably 

 less here the displacement of the fault no doubt is more than one 

 thousand feet. 



East of Galway a small fracture branches off on the north side 



