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, nor 

 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 setded 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 

 as a 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, are 

 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. I 

 explain, to myself, the subject as follow^s : — We have no chalk ; but 

 the green sand which w^ould, perhaps, have been embraced in chalk, 

 is intermingled with the more recent deposits. For older deposits 

 are often found extending into the newer. But organized beings, 

 created since these deposit's were made, cannot be embraced in them. 

 The Nautilus imperialis, and other later relics are found in the green 

 sand, intermingled with relics generally found in the chalk formation 

 of Europe 5 which seems to prove merely that the New Jersey 

 strata, in question, are made up of a commixture of old and new 

 materials ; for which analogies may be found among all geological 

 depositions. * * * * * 



The names of Mollusci were taken chiefly from Sowerby — of 

 Radiata, from Goldfuss — of Crustacea, from Brongniart. 



A less defective list of American petrifactions, with their particular 

 locations and stratagraphical relations, may appear in a succeeding 

 number of this Journal. A. E. 



