GEOLOGY OF THE LAKE PLACID QUADRANGLE 89 



while the best development of the levels is on the east side of the 

 hill. Here glacial lake origin seems certain. To the writer they 

 have exactly the same appearance as those on the hill near Keene.^ 

 Other groups of benches in the Lake Placid quadrangle are impor- 

 tant. On the hill, north of the junction of Clifford brook (the 

 " Clifford hill ") and the Ausable, a series shows the following 

 figures: 1074, 1070, 1020, 967 and 964. These are perhaps lacus- 

 trine in character, especially the 964-foot level which Johnson 

 admits is a wave-cut cliff. 



On the east bank of the river 3^/^ miles north of Keene (" Quarry 

 point") a series of probable stream terraces ranges as follows: 

 1028, 970, 921, 912.5, 903, 879 and 859. Doctor Johnson examined 

 them carefully with the writer and pronounced them the work of 

 the river; he likewise so regarded the terraces east of Upper Jay 

 (See plates 26 and 27). 



•Following the lead of Woodworth,^ the writer has plotted upon a 

 north and south plane the above data of beaches, terraces and sand 

 plains to see how they correlate among themselves and with the 

 proposed spillways (see figure 8), taking into account the post- 

 lacustrine deformation and the 20° inclination of the isobases. 

 This was done on the basis of Fairchild's recent studies which 

 furnish the approximate total uplift and amount of differential 

 tilting for the area by means of isobases. It is interesting to note 

 that a large number of these disputed levels fit into the general 

 scheme and thus strongly suggest glacial lake origin. The writer 

 is not, however, unmindful that pure coincidence may bring into 

 line a group of stream terraces that really have no relation to one 

 another. After lining up all available data there remained isolated 

 figures that are impossible to pigeon hole. It is quite possible that 

 with more careful examination in the field corresponding levels 

 will be found, but as the matter now stands there is some doubt as 

 to the character of some of the levels. With this uncertainty in 

 mind we shall, however, now discuss the next level, which probably 

 represents a glacial lake. 



Upper phase of the Upper Jay lake. The Upper Jay lake, like 

 its predecessor, the Wilmington lake, has left terraces and beaches 

 that are very definite in character. One of the beaches on the 

 " Keene hill " is 1017.7 feet in altitude, while a similar one on the 



' Coimpare pi. 22, fig. 2, facing p. 658 in Bui. Geol. Soc. Amer., v. 27. 

 ''Woodworth, J. B., Ancient Water Levels of the Champlain and Hud- 

 son Valleys, N. Y. State Mus. Bui. 84, pi. 28. 



