274 Organic Remains of the Ferruginous 
Arr. II].—Synopsis of the Organic Remains of the Ferruginous 
Sand Formation of the United States ; with geological remarks ; 
by Samuen G. Morron, M. D. of Philadelphia ; Member of the 
~ Amer. Philos. Society ; of the Academy of Natural Sciences of 
Philad. &c. 
“Je regarde les caractéres d’epoque de formation tirés de Vanalogie des corps 
organisées, comme de premicre valeur en Geognosie, et comme devant VYemporter 
P eg; : 
sur toutes | t diffe ] grandes qu’elles paruissent.”—Alez. Brong: 
“* = 
niart. 3 
Introduction. 
Tue study of that portion of American Geology embraced in this 
Synopsis, has constituted the chief recreation of my leisure hours for 
several years past; and almost every fact adduced in the following 
pages has been derived from my own personal observation. But 
while I speak with confidence of the fossils and mineralogical fea- 
tures of the region in question, I must confess considerable hesitation 
in repeating the inferences I have drawn from them. Not, however, 
because my opinions on this subject have changed from those already 
given in the Journal of the Academy ; but because I find those opin- 
ions are strenuously opposed by a gentleman who is altogether my 
senior in geological pursuits. I allude to my friend Professor Eaton, 
whose indefatigable exertions in the cause of science have justly ob- 
tained for him a reputation which cannot be enhanced by any enco- 
mium from me. 
Prof. Eaton, in a late Geological Prodromus, announces his inten- 
tion to prove that “the detritus of New Jersey, embracing the marl, 
is antediluvial, or the genuine tertiary formation.”* That it is ante- 
diluvial, strictly speaking, I have no doubt; but I am not yet con- 
vinced that it is tertiary. As the difference between us, therefore, 
is by no means inconsiderable, I beg leave to offer a few details on 
_ About two years ago Mr. Vanuxem expressed to me his opinion 
that the fossils of New Jersey denoted a secondary origin, and that he 
considered them, in general terms, as characterizing a deposit contem- 
peraneous with the chalk formation of Europe. I had about the 
“Amer. Jour. of Science, Vol. XVII. No. 1. p. 60. 
