438 J. D. Dana—Taconic Rocks and Stratigraphy. 
Canaan mountain, and probably part of that of other eastern 
ridges. 
The underlying position of the limestone was proved by the 
fact of universal eastward dips in the schist and limestone on ~ 
of westward dips along the east side of Mt. Washington, the 
two concurrent facts proving that the mountain is synclinal in 
structure; and also by stratigraphical sections from other 
ridges. In view of this underlying position over the whole 
breadth of the region from Canaan mountain to Winchell moun- 
tain, and the actual continuity of the limestone over Salisbury 
and Canaan, and over the adjoining towns north in Massachu- 
setts, it was concluded that the limestone, with some intercala- 
tions of schist, was one continuous stratum or formation. B 
similar evidence it was shown that the overlying schist be- 
longed to one continuous stratum. 
have given no descriptions of the iron-ore deposits along 
the marginal portions of the limestone areas because they are 
of secondary origin. But it is to be noted that if the view of 
their origin which I believe to be sustained by the facts* 18 
correct, they prove that during the transition from the making 
of the limestone to that of earthy sedimentary deposition there 
were in some parts conditions favorable to ferriferous depost- 
tions over the calcareous sediment; in other words, there were 
great sea-border marshes or basins to receive contributions 
from iron-bearing waters. These depositions, however, were 
portion of the limestone, sometimes for scores of feet in aie 
ness, is generally very impure from mixture with the mater!a’s 
of the schist. 
In Salisbury : b, Ore-Hill*; c, Chatfield*; d, Porter; % 
Forbes*; f, Clarke’s; g, a partial opening; A, Scoville’), Pt 
= - . + e ’ - 
eral Scovillite Sy Camp’s. In Sheffield: j, Little’s. In New 
d 
We have now to consider the variations in degree of metama”- 
phism, and in mineral constitution in these two strata on 
: rae over the region from west to east and from north t 
south, 
* This Journal, xxviii, 398, Nov. 1884. 
