POST-LACUSTRINE DEFORMATION 669 



DEFORMATION CHART FOR THE KEENE VALLEY GROUP 



Calculated deformation- 

 Late Altitude feet per mile 



South Meadows 2,000-2,040 



Keene Lake 2,000-2,040 About 



Newman Lake 1,740-1,875 



Saranac waters 1,450-1,600 



Saint Hubert Lake About 1,300+ 



Wilmington Lake 1,100-1,140. 



3.09 

 2.94 



Upper Jay Lake 1,000 2.79 



Haselton Lake 960 2.63 



Lower Jay Lake 940 



Otis Lake 900 



Rocky Branch Lake 860 



Clifford Lake S40 2.60 



Styles Lake 820-825. 



Wainright Lake 760-770 2.00 ( ?) 



Although too much stress should not be put on the accuracy of the 

 figures given, they would seem to indicate, nevertheless, that the datum 

 planes for the lakes differed slightly in every case, higher lakes showing 

 a deformation slightly greater than those of lower altitudes. 



EXPLANATION OF CHART 



Following the lead of Professor Woodworth, 21 the writer has attempted 

 to give, by means of the accompanying chart, the relative positions of the 

 important terraces, deltas, and beaches which have been cited in establish- 

 ing the glacial lake succession of the lower series in the Keene Valley 

 group. 



The chart is essentially a north and south plane on which the shoreline 

 phenomena of the different lakes situated in the Lake Placid and Ausable 

 quadrangles have been projected. It clearly shows that the datum planes 

 of the lakes rise to the north, and that each plane has a somewhat different 

 gradient, the higher lakes having the steeper slope. 



Professor Fairchild has suggested that the datum plane lines should 

 not have been drawn through the actual bed surfaces of the outlet spill- 

 ways, as this leaves out of consideration the depth of water. Such a 

 change would make the chart more accurate. If the datum planes are 

 parallel, as Professor Fairchild believes, it would be necessary to increase 

 the depth of the water flowing over the spillways as we descend to the 

 glacial lakes of lower altitudes. 



Any satisfactory conclusion must wait until the altitudes of the shore 

 phenomena are very carefully measured. 



21 J. B. Woodworth : Ancient water levels of the Champlaln and Hudson valleys. N. Y. 

 State Mus. Bull., No. 84, pi. 28. 



