206 8. W. Ford—Age of Rocks near Schodack Landing. 
Art. XXVIL—On the Age of the Glazed and Contorted Slaty 
Rocks in the vicinity of Schodack Landing, Rensselaer County, 
. Y.; by S. W. Forp. 
DuRING the latter part of the month of May, after a day 
spent in the study of the Primordial rocks of the town of 
Stuyvesant, Columbia County, the writer made a hasty ex- 
amination of the folded slates directly back of the Schodack 
westward as far as the Hudson River railroad track in two 
conspicuous promontories, and finally disappear altogether, 
out a hundred yards distant from the Stuyvesant Primordial 
beds,* a fault intervening. In these promontories the slates are 
d contorted almost beyond 
but ng etal so along the line of the Hudson River railroad, 8 
short distance south of the county line, and about two hundred 
yards north of the residence of Mr. Patrick McCabe. At this 
G. pristis, G. ramosus, 
G. mucronatus, G. scalaris, 
G. sagittarius, G. sextans, 
G. tenuis, G. furcatus, 
G. bicornis, G. gracilis, 
* Directly south of the more southerly promontory, the surface is low oF 
marshy ; and, a ter crossing this, the rocks at one point resemble those of the 
nt. com 
tact with each other, but I have not, as yet, been able to fully satisfy myself upo® — 
this point. 
