ae rere 
ce 
of the Age of the Red Sandrock Series of Vermont. 373 
ada in regard to a region of country to which my own examinations 
had not extended, I have nothing left but to go back to the position 
sustained by paleontological evidence.”* As I understand this, 
it means that he never examined the country in the neighbor- 
hood of the Georgia locality of trilobites, and if he did not, then 
this section must have been compiled from the observations of 
of some one else. At all events the section proves very clearly 
that at the time he drew it up he did not know the age of the 
Red Sandrock Series. 
The next section crosses the state of Vermont from Burling- 
ton eastward. On the Vermont map the Red Sandrock is here 
ee miles wide along the lake shore, On the east side of it is 
a belt of Holian limestone, also about three miles in width. The 
ore half way to the Green Mountains. A few beds of the 
Potsdam sandstone are then indicated as coming out from under 
the so-called Trenton limestone in the town of Willston. In the 
Vermont map there is a small outlier of granular quartz rock 
just about this locality, lying partly in Willston and partly in 
Hinesburgh, but it is totally separated from the Red Sandrock. 
‘The remainder of this section does not cross any of the rocks 
Map they are the Georgia sl 
slates of Dr Oi 
* See Prof, Hall’ the Editors of this Journal, [2], xxxi, p. 220, March, 
1861. In hie ‘cig Cage to give the late Prof. ee credit for having 
Stiginated the mistake with regard to the Vermont rocks. 
. 
