i6o 
The American Geologist. 
March, 1903. 
ON THE MANLIUS FORMATION OF NEW YORK.* 
B3' Charles Schuchert, U. S. National Museum. 
Introduction. ^ In working- out the very complete sequence 
of the Ontaricf and Lower Devonic rocks of Maryland recently 
published, $ it became necessary to make detailed correlations 
with the New York series, the standard of comparison for the 
Paleozoic formations of the interior region of America. In 
this correlation the question arose as to the actual age of the 
formations of the Helderberg mountains immediately above 
the Hudson River formation, and particularly as to the proper 
position of the "Coralline limestone" of the Schoharie section. 
The fauna of the "Coralline limestone" holds a definite zone 
in the Appalachian region and its true position is proven in 
Maryland, where it holds a horizon far above the Niagaran 
with which Hall had correlated it. The first object of this 
article then, is to prove the actual position of the "Coralline 
* Published bj permission of the Secretary of the Smithsonian Institution. 
tThis and otlier terms are defined by Clarke and Schuchert, Science, 
n. s., X, i8g9, pp. 874-878; and Am. Geologist, Vol. 25, pp. 114-119. 
To facilitate easy reference to the formations in the New York series, 
Ihe following condensed table is presented with some emendations 
from the work cited : 
w > I 
T- • \ Hamihon 
( Marcellus 
Ulsterian S Onondaga (Corniferous) 
} Schoharie 
Devonic -| | Decewville 
•5 r Oriskanian... J Esopus (Caudagalh) 
I o I I Onskany 
L ,g -^ l^ Kingston 
2 I ( Becraft (Upper Pentamerus) 
• "5 1^ Helderbergian -I New Scotland (Dehhyris) 
( Coeymans (Lower Pentamerus) 
Manlius (Tentacnlite) 
f Manlius 
Ontaric 
(Silurian or 
Up. Silurian) 
.ayugan. 
Niagaran. 
Oswegan . 
y Sahna 
Rondout (Upper Waterhme) 
Cobleskill (Coralline h.) 
\ Bertie (Lower Waterlime) 
\ Salina proper 
f Guelph 
) Lockport 
1 Rochester 
i CHnton 
/ Medina 
\ Oneida and Siiawangunk 
% On the Lower Devonic and Ontaric formations of Marvland. By C. 
Schuchert. Proc. V. S. Nat. Mus., xxvi, p. 413-424, Feb., 1903. 
