TO HIS EXCELLENCY SILAS WRIGHT, 



Governor of the Slate of New-York. 



SIR, 



I HEREWITH submit that part of my Report on the Palaeontology 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. 

 Albamy, September 1, 184^ 



