184 J. D. Dana on the Green Mountain Quartzite. 
¥. 
5 high ; feet long 
feet long, and 120 feet wide, and 45 high; 4° is 1,080 ie: 
and 450 wide and 70 feet above the road on the re 5 is 
1,400 feet long, and 30 feet above the plain; 6 is 400 feet < 
The surface between the quartzite ledges is vovered wi 
and the Eolian of Vermont; and the same wide band stretches 
southward, and somewhat westward, through Salisbury, Conn., 
and Dover and Pawling in Dutchess Co., N. Y. gai cen 
This limestone is generally admitted to be of Lower o ee 
age, and to represent more or less of the time ag ae 
ciferous to the Trenton periods. The fossils from the 
encrinal stems, and have been regarded as indicating that “ 
rock is not older than the Trenton. | Mr. Billings has apt: 
evidence tending to prove that limestones of the Quebec ee 
are included in the formation; and if so, the Chazy is pr 
a base of limestone, while made up mainly of the gpd 
schist, a fine-grained, fragile arenaceous rock, in eri on The 
like. The layers of both rocks are nearly horizontal. 
* Geol. of Vermont, 2 vols. 4to, 1861, i, 418. ooski 
+ In a paper on a Primordial limestone in Northern laraeeny ecapitig 
limestone—at Page 145 of this volume, Mr. E. Billings suggests tha’ but may be 
bridge limestone may not merely include this Primordial limestone, na, which 
made up of it. His conclusion is based on sections by Professor psagsiaett it. 
I sha 'w, before the close of this paper, are not of a kind to Primordi 
Moreover it will appear, on what I think is good evidence, that the h it may 
does not enter at all into the proper Stockbridge limestone, althoug 
Constitute other areas not far distant from it, 
