208 8S. W. Ford—Age of Rocks near Schodack Landing. 
occurrence of this band, I have no doubt that it is a regular 
member of the slate formation. It is fossiliferous at both of the 
the hemispherical variety of Cheetetes lycoperdon. None of the 
species of this locality are distinctive of the Utica slate, and 
recognized among the folded and contorted rocks of the region. 
In view of what I have recently and for several years past, 
2. That a great dislocation, bringing up (at least for a large 
portion of the distance) the rocks of the Primordial zone upon 
the east side of the line of fracture, and placing them upon the 
same level with, or even higher than, the rocks of the Hudson 
River group upon its western side, runs from western Vermont. 
southward through the western portion of Washington, Rens- 
selaer, Columbia and Dutchess counties; and that this disloca- 
tion does not strike across the Hudson River opposite, or so as 
to pass through Rondout, as some have supposed ; but, on the 
contrary, before crossing, extends on southward beyond Rhine- 
cliff station, in Dutchess county, for several miles.’ 
8. That this dislocation probably occurred at the close of 
the Lower Silurian as urged by Professor Dana. 
4. That over a considerable part of the territory traversed by 
this fault, the Primordial rocks wall against those of the 
Hudson River group unconformably ; but that, in the majority 
of instances wlfere they come together, the older beds have 
been made to overlap the newer conformably. 
Johnstown, N. Y., July 5th, 1884. 
