GEOLOGY OF THE VICINITY OF LITTLE FALLS 73 



Little Falls fault, in the northern part of the sheet. From this 

 standpoint theTefore the large faults do yet exert a large influence 

 on the topography in their vicinity. 



PLEISTOCENE (GLACIAL) DEPOSITS 



The Pleistocene deposits of the district, and the history which 

 they record, can receive adequate consideration only after a 

 thorough study of a wide area. Brigham has recently published 

 an excellent paper on the ^^ Topography and Glacial Deposits of 

 the Mohawk Valley," containing numerous references to the 

 literature of the subject.^ The writer has been over such a scant 

 amount of the area that he can add little save some local details 

 to the general discussion. 



The amount of glacial erosion in the district does not seem to 

 have been great. The soil and weathered rock were removed and 

 the underlying rock surfaces scoured and polished, but the 

 ^'eneral topography seems to have been but scantily affected. 



Professor Chamberlin has discussed the general ice movement 

 in the Mohawk valley, holding that there was an easterly moving 

 ice tongue in the western portion of the valley, and a westerly 

 moving one in the eastern portion, the two meeting near Little 

 Falls.2 His final statement sums up as follows : 



I hesitate, at this stage of the inquiry, to encourage any con- 

 tident opinion in regard to the exact history of glacial movements 

 in the Mohawk valley, further than the general presumption that 

 massive ice currents . . . swept around the Adirondacks and 

 entered the Mohawk valley at either extremity, while a feebler 

 current, at the hight of glaciation, probably passed over the 

 Adirondacks and gave to the whole a southerly trend. 



The readings of glacial striae which he reports are quite in 

 -accord with this view; and with it the writer's similar observa- 

 tions also agree. 



Away from the valley the writer has only two observations on 

 striae, not a sufficient number on which to base any deductions. 

 One mile north of Salisbury Centre striae bearing s. 30° e. were 



^Geol. Soc. Am. Bui. 9:183-210. 

 ^'Chamberlin, T. C. United States Geo!. Sur. 3d An. Kep't. p.361-65. 



