138 Geological Equivalents. , 
ton’s excellent article on that subject, in Vols. XVII and XVIII 
of this Journal. I will add the Nautilus imperialis, which we took 
from the green sand with the Exogyra costata of Say. I men- 
tion this because it has never been found in Europe except in the 
Tertiary formation; and Say’s species is not found in Europe, not 
several other New Jersey relics which are assumed as secondary. 
Marine sand (bagshot sand) and Crag. No remains found ex- 
cepting those embraced in the green sand marl-beds. 
Shell marl. Generally washed, or settled into depressions. Planor- 
bis obtusa, P. alba, P. paludosa, P. annulata, Bulla rivalis, Lim- 
nea longiscata, L. minima, (probably a variety of longiscata.) 
Cenomice muscioides, (in the tufa, embraced in the shell marl 
asa stratum, along the Erie Canal, particularly from a mile 
west of Nine-mile creek.) 
It will be perceived on comparing many of these eighty species, in- 
cluding the seven genera of vegetable fossils, with those set down in 
Woodward’s synopsis, that the American strata here referred to, até 
the true equivalents of the strata of the same names in Europe. 
1 have not omitted to study the excellent and very interesting arti- 
cles on what I treat as the New Jersey tertiary, by Messrs. Morton, 
Lea, and other indefatigable naturalists of the Philadelphia corps; but 
I satisfy myself with this short answer. The characters of the strata, 
the lignite, the amber, and the iron, compare perfectly with the Euro- 
pean tertiary, when examined along the south bank of Amboy bay; 
and across to the Neversink ; where they can be fairly inspected. 
explain, to myself, the subject as follows :—We have no chalk; ut 
the green sand which would, perhaps, have been embtaced in ebalb, 
is intermingled with the more recent deposits. For older deposits 
are often found extending into the newer. But organized beings, 
created since these deposits were made, cannot be embraced in them. 
The Nautilus imperialis, and other later relics are found in the gre 
sand, intermingled with relies generally found in the chalk formation 
of Europe; which seems to prove merely that the New Jersey 
strata, in question, are made up of a commixture of old and ne™ 
materials ; for which analogies may be found among all geologic! 
depositions. * * ** x 
The names of Mollusci were taken chiefly from Sowerby—! 
Radiata, from Goldfuss—of Crustacea, from Brongniart. "es 
less defective list of American petrifactions, with their particular 
locations and stratagraphical relations, may appear ina succeeding 
number of this Journal. A. E. 
