424 Scientific Intelligence. 
regarded as a continuation of the Marcellus Shale, or the Genesee Slate 
ef New York.” 
As the authors of the paper under review, raise no objection to the 
—_ taken by Meek and Worthen in regard to the Black Slate of the 
rest representing the Genesee Slate instead of the Marcellus Shale, as 
n maintained; and admit that the Rockford Goniatite bed does 
The grounds then upon which the identity of these rocks with the 
ung in New York, is maintained, is, that the Goniatite mentioned 
by Prof. Hall, and a few other fossils, the names of which are not givel, 
from a bed in northwestern Ohio, regarded as a continuation the Che- 
mung, are considered identical with species in the rocks referred to _ 
horizon west of the Cincinnati axis. At the same time it is admit 
the fauna of the Burlington limestone, &c.” Hence the startling coneltr 
sion is arrived at, and stated as a general principle, that “if gto 
nfi . 
thus completely ignoring the use of specific affinities in the iden 
sb strata at distantly separated localities, even im the same zones of 
; e, ' 
: If these conclusions are sound,—that is, if in tracing the same for 
tion westward, which is in eastern New York characterized by 
* We are aware Prof. Agassiz has shown that the fossils of synchronous, ater 
in different zones of latitude, sometimes present much more marked diffe we 
i maio 
than geologists have generally supposed. Yet it will scarcely be 
think, that the striking diflerenane 0 ed between the fossils of the Coe 
oup in southern New York, and those of some of the beds referred to tha: Re 
an Ohio, and at be due to differences of bel 
