800 Scientific Intelligence. 
The limestones of St. Lawrence and Lewis counties are usually 
beds of granitic and other rocks, with specular iron-ore, are not of 
true Laurentian age, and their relations to the latter are at present 
not well determined, except that they are of more recent date in 
the geological series. 
e simple point which I wish to demonstrate is that this lime 
stone of Essex and adjacent counties does not belong to the 
Laurentian system, either lower or upper. That it is a formation 
deposited along the flanks of, and within the Laurentian area, at a 
period subsequent to the deposition, metamorphism and disturb- 
ance of the rocks of authentic Laurentian age, and that it appar 
ently holds a place in the series between the Laurentian and 
Potsdam periods, but whether of Huronian age or otherwise Id 
not pretend to say, and it may even prove of later date than this. 
ith these facts before us it becomes a matter worthy of 
a 
age, are really Laurentian, or hold the place and position of those 
of Northern New York. ae : 
orE.—Since preparing the statement giving views here pre 
add this note, but with the permission of the Associat 
make a more extended reference in the final publication.— 
Courier, Aug. 25. New York and 
= : 
3. On the Geology of the Southern C ote of New to the 
is mainly to state and illustrate the results of four years a " pie 
chiefly in the southern counties of New York and the ad) 
Ir. Andrew Sherwood, 
Red Sandstone, or Catskill group, within the limits of New Tork, 
geological map of the State. : ae tate 
The assertion of the non-existence of this formation 1 pense 
. me portions 
found : 
eded in the eluet 
g fact, it became 
evident that one could travel from Schoharie county t? - 
