40 
Frank Carney 
- The compact sandstone layer, referred to by Clarke and Luther, 
about 125 feet above the base of the Cashaqua as revealed in the 
Naples region, appears near Keuka Park and persists southward 
about one and one-half miles; much of this distance it forms a 
prominent bench. 
The next formation that might include beds for registering dif- 
ferential weathering effects is the Hatch shales and flags, which | 
attain a thickness of about 300 feet.^^ Along the slopes of Bluff I 
Fig. 2. View of west shore Penn Yan branch about two miles north of Dun- I 
ning’s Landing. Shows terrace No. 2, and what is apparently the lowest terrace 1 
altered probably by ice-erosion. 
Point the sandy layers of this formation, though irregular in both ! 
horizontal and vertical distribution, are conspicuous. The great- ! 
est thickness of shale noted in any exposure is about 12 feet; the | 
base of this horizon is 261 feet (corrected aneroid reading) above ! 
lake-level; it could not be demonstrated that this horizon of shale ! 
had much horizontal extension. Likewise the arenaceous layers, | 
the heaviest noted being under 2 feet, do not persist horizontally. ! 
Next in rising section is the Grimes sandstone, estimated by 1 
|i 
N. Y. State Mus,, Bulletin dj, p. 31, 1904. | 
D. D. Luther, N. Y. State Mus., Bulletin lOi, p. 47, 1906. 1 
