TO HIS EXCELLENCY SILAS WRIGHT, 
GOVERNOR OF THE STATE OF NEW-YORK, 
SIR, 
I HEREWITH submit that part of my Report on the Paleontology of New- 
York, containing descriptions of the organic remains found in the lower 
division of the system, which comprises the Potsdam sandstone, Calciferous 
sandstone, Chazy limestone, Birdseye limestone, Black-river limestone, 
Trenton limestone, Utica slate and Hudson-river group. All the species 
described will be illustrated by figures drawn and engraved from original 
specimens, the greater part of which have been collected by myself from 
these strata, and the others received from individuals whose authority for 
their geological position will be cited. 
I have the honor to be, 
With great respect, 
Your obedient servant, 
JAMES HALL. 
Ausany, September 1, 1846. 
