Mesozoic and Ccenozoic Geology and PalfBontology. 



NOBTH AMERICAN MESOZOIC AND C^NOZOIC 

 GEOLOGY AND PALAEONTOLOGY. 



By S. A. Miller, Esq. 



[Continued from Vol. 2, page 244-] 



In 1829, Dr. Morion illustrated a section of Cretaceous rocks, 27 8-12 

 feet in height, found in a bluff, on the margin of Crosswick's Creek, New 

 Jersey, and separated the Cretaceous of New Jersey and Delaware in- 

 to the lignite strata and the marl. He relied, in determining the 

 Cretaceous age of the rocks, upon the genera Terebratula, Gryphcea^ 

 Exogyra^ Ammonites.^ BacuUtes and Beleynnites. He described,* from 

 an excavation for the Delaware and Chesapeake canal, Ostrea falcata^ 

 and from other places, Terebratula harlani^ T. fragilis^ T. sayi^ 

 Gryphcea mutahilis and G. vomer. 



In 1830,f he published his Synopsis of the Organic Remains of the 

 Ferruginous Sand Formation of the United States, with geological re- 

 marks. He treated of the distribution of the strata, and mentioned 

 many localities in the eastern and southern States where the}- are ex- 

 posed, and also discussed the mineralogical characters of the marls. He 

 described -SeZe??i^?'^es americaniis, B. ambiguus, Cucullce a vulgaris^ now 

 Idonearca vulgaris^ Ammonites delawarensis, A. vanuxemi.^ Spatayi- 

 gus Stella, Ananchytes craciferus, A. cinctiis, A. Jimbriatus and An. 

 thophyllam atlanticum, now Montivaltia atlantlca. He also deter- 

 mined that two species, figured in Sowerbj^'s Mineral Conchology, under 

 the names of Chama heliotoidea and C. conica^ belong to Say's genus 

 Exogyra. Sowerby soon after adopted his determination, which was 

 the first instance in which the genus of an American author was 

 adopted in Europe, where it required the separation of the species 

 which had been referred to an older genus. 



In 1833, J; he published a Supplement to his Sjmopsis, in which he il- 

 lustrated and described Rostellaria arenaria, now Anchiira arenaria, 

 Tornitella bullata, Conus gyratus, Cytherea excavata. now Cyprimeria 

 excavata, Cardita decisa, Clavagella armata, Plagiostoma gregale, 

 now Spondylus gregaUs, P. pelagicum, now Lima j^^lf^ffica, Pecten 

 2:)er planus, P. venustus.^ Anomia argentaria, Gryphoia plicatella, Os- 

 trea falcata, var. nasuta, 0. mesenterica, 0. tortuosa, 0. urticosa, 



■■' Jour. Acad. Nat. Sci., vol. 6, part 1. 

 t Am. Jour. Sci. & Arts., vols. 17 & 18. 

 t Am. Jour. Sci. & Arts., vols. 23 &24. 



