GEOLOGY OF SARATOGA SPRINGS AND VICINITY 



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Hathorn spring record. The deep bore at the Hathorn spring 

 went down 1006 feet. The driller reported 62 feet of drift at the 

 top and 231 feet of Potsdam sandstone at the bottom, the drill rest- 

 ing in this formation. Amster- 

 dam limestone was found di- 

 rectly under the drift. The 

 Potsdam is so thick that it seems 

 that the full thickness of the 

 Theresa must also be included. 

 If this be the case, the Hoyt, 

 Little Falls, and Amsterdam 

 have a combined thickness of 

 713 feet, whereas judging by 

 such other evidence as we have 

 of their thickness it should not 

 exceed 450 to 500 feet. This 

 suggests that the drill may have 

 crossed a fault so as to go 

 through a certain thickness of 

 beds twice. This would be quite 

 possible since the drilling started 

 on the Amsterdam wedge and it 

 is only necessary to assume that 

 the branch of the fault east of 

 the wedge hades toward the 

 main fault in order to have just 

 the necessary conditions, as illus- 

 trated in figure 8. The drill core 

 is in existence but we have not 

 had opportunity to study it. 

 Such study should show whether 

 any part of the section is dupli- 

 cated in the record or not. If 

 there is duplication the illustra- 

 tion probably furnishes the 

 reason. If there is none, then 

 the Little Falls dolomite and 



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Hoyt limestone taken together are considerably thicker than we have 

 supposed. 



General remarks on the faults. The large faults of the Mo- 

 liawk and eastern Adirondack regions show a frequent tendencv 



