— 
= 
Beds thes hoon found below-the Chazy limestone in New York or Canada, 
although in the latter country one lamellibranchiate shell, a large Cono- 
cardium has been discovered in the Calciferous sandrock, The Vermont 
surveyors seem to have been to a great extent influenced by the fossil tes- 
timony as above interpreted in regarding the Quartz rock as of the age 
of the Medina sandstone. 
The next formation of importance is the Eolian limestone, a vast de- 
posit of crystalline rock 2000 feet in thickness, apparently overlying the 
mate of the weight of the evidence afforded by these remains. It a 
pears that none of the species have been determined and that the conelu- 
sions were drawn from the range of the genera. Huomphalus both with 
iferous forms. No one can distinguish fragments of Petraia (Strepte- 
lasma Hall) from Zaphrentis without a knowledge of the age of the 
rock in which they are found. There is not the slightest generic differ- 
ence between Stromatopora and Stromatocerium (Hall), the latter genus 
which we now kaow to beabout the age of the Potsdam. The evidence 
of the fossils therefore does not furnish any reasonable ground for placing 
this formation above the Lower Silurian. In the Report it. is_not posi- 
: ed in the Carboniferous system, the question being left open, 
i 
ve ible. The error is only a consequence of the old 
ee ek inte i to the publication of the Ist vol. of the 
: ; k be developed upon a magnificent 
The Eolian limestone appears to be de Yana : pe 
i onstitute how- 
Eol ibit a rfect synclinal structure. They constitute 
a epg yea anteink but independent ranges lying near 
and parallel thereto. The Quartz Rock forms a belt between the lime- 
Stone and the gneiss. The gneiss appears to be the oldest rock; the 
