* A 



TO Ills EXCELLENCY SILAS WRKiHT. 



fiuvfiiior of tlie Sliile of i\tw-\ork. 



SIR, 



I HEREWITH submit tlial 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, Calcifcrous 

 sandstone, Chazy limestone, Birdseye limestone, Blaclc-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. 



1 Ikivc tlic honor to Ijf, 



With gie;i( rcsi)ect, 



Your iihcilu'lll scrvaiil. 



JAMES HALL. 



Albany, Septenibet 1, 1849^ 



