W. M. Davis—Nonconformity at Rondout. 393 
and underlying formations being due to a fault, at least at this 
point, for as shown in figure 1, the limestone fits closely into 
Series of rocks described a 
The most pronounced effects of this deformation are now seen 
along the bluffs of Lower Helderberg limestones. Beginning 
at the northeast near the Hudson, the rocks either stand on 
end or dip strongly to the west; they fall to a less angle on 
approaching Rondout and then are for a time more or less hid- 
* Geol. New Jersey, 1868, 135. Second Geol. Surv. Penn., G 6, 150. 
