/. Hall on the Cretaceous Strata of the Vnited Stales. 75 



SECTION OF THE SUCCESSIVK BEDS COMPRISING THIT CRKTACEOUS FOR- 

 MATION OF NEW JERSEY. 



8. Green Saxd, 3d or Upper bed. 



This bed admits of a triple division, the central portion is nearly destitute of 

 fossils, while tliose of the upper and lower divisions are mostly dissimilar. 



7. QCARTZOSE SAND RESEMBtING BEACH SAND. 



This 







4) 



r 6. Green sand, 2d bed. 



(a) Yellow limestone of Timber Creek. 



Characteri2cd by Eschara dlgitata^ Montivaltia {Anthophyllum) atlanti- 

 cum, Nv>cleolites crudfer, Anackytes cincius. A, fimhriatus^ Morion. 

 (6) A bed of nearly unchanged shells. 



Among the characteristic fossils of this bed are GrypTiona vomers G. con- 

 vexa, and Terebratula HarlaiiL 



(c) Green sand, etc. 





Cucullea vulgaris is the most characteristic fossil of the lower division, 









5. QUARTZOSE SAND HIGHLY FERRrCINOUS THROUGHOUT, AND ARGILLACEOUS IN ITS 



UPPER PARTS. 



lo ^ This rock is sometimes indurated or cemented by oxyd of iron. 



Exogyra costata, Oslrea lari'a, Belannitella mucronata, Pecten (Neitha) 

 guinque-coslatus ; and many other fossils mostly in the condition of casts 

 of the interior, or impressions of the exterior, 



4. Green sand, 1st o» lower bed. 



Several subdivisions may be recognized depending on the character of the 



marl, etc. 



Exogyra costaiay Ostrea larva, Belemniiclla mucrotiata, Terebratula Sayi, 

 {Gryphcea convexa and G.mutabilis), Ostrea vesicular is, 



3. Dark colored clay containing green sand in irregular striper and spots. 



Ammonites Del awarcnsiSj Ammonites placenta, A. Conradi, Baculites ova- 

 tuSj casts of Cardlum. 



2. Dark colored clat. 



[Position of beds Nos. 2 and Z of the Nebraska Section.— At the present time 

 the evidence tends to show that No. 1, of the Nebraska section is represented 

 by Nos. 1 and 2, and that Nos. 2 and 3 of the Nebraska section are wanting, 

 and would find a place between Nos, 2 and 3 V this section if existing.] 



This bed contains large qnantities of fossil wood ; (no animal remains 



are known to occur in it), 



1. Fire clay and potter's clay. 



This bed contains fossil wood, and nuraerouB impressions of leaves ; but 

 no animal remains. 



Gneiss. 



Ill Alabamaj according to tlie report of Prof. Tuomey, tlie 

 cretaceous strata admit of a threefold diyisiou ; the upper mem- 

 bers consisting of tlie *^ rotten limestone," a central arenaceous 

 group, and a lower dark colored claj. 



Without at present having the means of exact comparison, it 

 may be inferred that there is a close agreement between the dif- 

 ferent members of the series in Alabama and New Jersey. The 

 pecific identity of many of the characteristic fossils, leaves no 



