INTRODUCTION. 3 
pressus, Scaphites nodosus, Helicoceras Mortoni, H. tortum, H. umbilicatum, Ptycho- 
ceras Mortoni, Fusus vinculum, Anisomyon borealis, Amauropsis paludiniformis, 
Dentalium gracile, Crassatella Evansi, Cucullea Nebrascensis, Inoceramus sublxvus, 
I. tenuilineatus, I. Nebrascensis, I. Vanuxemi, bones of Mosasaurus, &e. 
No. 5. Gray ferruginous and yellowish sandstones and arenaceous clays, 500 feet in thickness. 
Location: Fox Hills near Moreau River, above Fort Pierre near Long Lake, and 
along the base of Big Horn Mountains. Characteristic fossils are Belemnitella bulbosa, 
Nautilus Dekayi, Ammonites placenta, A. lobatus, Scaphites Conradi, S. Nicolleti, 
Baculites grandis, Busycon Bairdii, Fusus Culbertsoni, bones of Mosasaurus, &c. 
A section of the New Jersey Cretaceous deposits, according to Messrs. Meek and 
Hayden,‘ as compiled from the observations of Prof. Geo. H. Cook, exhibits the 
fallowing structure :— 
EARLIER CRETACEOUS— 
No. 1. Dark blue, ash colored and whitish clays and micaceous sand, with thin seams of lignite. 
Great quantities of sulphuret of iron. Fossil wood in some of the layers in large 
quantities, and angiospermous leaves. 130 feet or more in thickness. 
LATER CRETACEOUS— 
No. 4. Dark clays, with occasional streaks and spots of Greef-sand, containing Ammonites Dela- 
warensis, A. placenta, Baculites ovatus, etc. 130 feet in thickness. 
First or lower bed of Green-sand, containing Nautilus Dekayi, Baculites ovatus, Belemni- 
tella mucronata, Terebratula Sayi, Ostrea larva, Exogyra costata, Gryphea vesicu- 
laris, ete. 50 feet in thickness. 
Quartzose sand, highly ferruginous ; argillaceous in its upper part, containing Belemnitella 
mucronata, Ostrea larva, Exogyra costata, Neithea Mortoni, ete. From 65 to 70 feet 
in thickness. 
No. 5. Second bed of Green-sand. This includes the yellow limestone of Timber Creek, containins 
Montivaltia Atlantica, Nucleolites crucifer, Ananchytes cinctus, ete. Also a bed of 
neatly unchanged shells, among which are Terebratula Harlani, Gryphea lateralis, 
G. convexa, ete. Lastly, Green-sand, ete., containing Scaphites Conradi, Baculites 
ovatus, Ammonites placenta, Cucullexa vulgaris, ete. From 45 to 50 feet in thickness. 
TERTIARY— 
Quartzose sand resembling ordinary beach sand, and destitute of fossils. From 45 to 50 feet in 
thickness. 
Third, or upper bed of Green-sand. 60 feet in thickness. 
In Alabama, according to Prof. Winchell, as communicated by Messrs. Meek 
and Hayden,’ the Cretaceous formations are as follows :— 
EARLIER CRETACEOUS— 
No. 1. Dark blue and mottled shales or clay, with vegetable remains. 300 feet or more in thickness. 
LATER CRETACEOUS— 
No. 4. Grayish and yellowish sand, with fossil wood and Teredo tibialis; 15 feet. 
Gray sand with Ammonites placenta, A. Delawarensis, Gryphxa vesicularis, Exoqyra 
costata, Inoceramus biformis, Pecten quinquecostatus, ete.; 6 feet. 
Soft white limestone (“ Rotten limestone”), with Nautilus Dekayi, Ammonites Delawarensis, 
Baculites ovatus, ete.; 150 feet or more. 
Loose white sand, with Ostrea larva, Pecten quinquecostatus, Gryphxa vomer, etc. ; 45 feet. 
1 Proc. Acad. Nat. Sci. 1857, 127; 1861, 426. 2 Thidem 1857, 126. 
