78 



NEW YORK STATE MUSEUM 



The increasing rate of uplift as we proceed northeast is clearly 

 shown above, and is in entire harmony with facts in other portions 

 of the basin of the Great Lakes. Leverett has shown [loc. cit. 

 p. 755] that for 200 miles west from Ashtabula, O., the Whittlesey 

 shore has practically no variation in altitudes, while east from 

 Ashtabula to New York the uplift is a little less than one foot a 

 mile. Farther northward in the Great Lakes basin the uplift is 

 more rapid than any rate in our district, the gradient east of Lake 

 Ontario being about 6 feet a mile. In the study of the beaches of 

 Lake Iroquois along the north shore of Lake Ontario 1 Professor Cole- 

 man finds that the rate of deformation is greatest in a line 20 east 

 of north, and that it increases northward, heing 2 feet a mile from 

 Hamilton to York, 3.4 feet a mile from York to near Port Hope, 

 and 4.17 feet a mile from the latter point to West Huntington. 



Using Professor Coleman's isobase of west 20 north by east 

 20° south we find that the Hamilton-York section of the Iroquois 

 shore corresponds in position of deformation with our Crittenden- 

 Pond section of the Warren shore, and that the gradients are 2 and 

 2.6 feet a mile. The correspondence is sufficiently close to indicate 

 that a large area is involved in the same deformation. 



The increase in elevation along these New York shore lines 

 toward the northeast dees not represent the full deformation of 

 the area. The direction of greatest uplift of certain beaches about 

 the upper Great Lakes has teen found by Taylor to lie along a line 

 27 east of north, while in central New York it is believed that 

 the line of maximum deformation is more nearly north and south 

 or even west of north by east of south. As the direction of our 

 shore line is about 45 east of north it follows that the maximum 

 deformation of the region is somewhat greater than is indicated by 

 the beaches. 



The only north and south direction of any beaches in our district 

 is the Whittlesey shore from Gowanda north to North Collins. 

 In the 5.5 miles south from North Collins to the residence of Mr 

 B. W. Law there is a fall of 11 feet, or at the rate of 2 feet a mile, 

 while the gradient southwest from North Collins to near Smiths 

 Mills is only 1.4 feet a mile. This comparison is only suggestive, 

 as the distances are short and even a slight variation or error would 

 make a disproportionately large difference in the result. 



The general uniformity in vertical distance including the several 

 bars of the two shores seems to prove that there was small deforma- 

 tion of tilting of the region during the life of the lakes [see p. 65]. 



'Coleman, A. P., The Iroquois Beach in Ontario. Geol. Soc. Am. Bui. 

 1904. i's: 347-68 



