268 General Notes. [March 
consists of Erie Clay. None of the underlying rocks of the 
per Silurian series are exposed. Owing to weathering, the 
surfaces of the Erie Clay soon cease to show their stratification. 
But here, after the slide, the great hummocks and pyramids— 
thickness, easily splitting into slabs. The landslide, in this 
material, extended along the face of the bluff for seven hundred 
feet. A belt, eighty feet wide, was detached from the brow of 
the table-topped cliff, and in sinking sixty feet, caused the for- 
te 
po 
; bed of river; S, stones lifted by 
» grassy ] d forward; H, h 
r 
one hundred feet to one inch. 
Owing to the forward movement and reaction, the deposits of 
the Erie Clay have been raised into perfectly truncated anticlinal 
folds, which are composed of vertical strata more or less twisted. 
The vertical edges, where not concealed, are forty-four feet across, 
and on them—ten feet above the surface of the river—are resting 
the pebbles of the former bed of the stream now elevated i 
sloping surface, with the trees still standing, but sloping at 
angles from twenty-eight to thirty-five degrees from the perpen- 
- dicular towards the hill, as the present slope is that of a surface 
which formerly stood farther up the hill-side, at a higher angle. 
marked across the transporte grassy surface by a deep longitu- 
dinal fissure. The eastern end of the slide consists only of a 
confused mass of hummocks and pyramids. a 
b 
