Mesozoic and Cainozoic Geology and PaJa;ontology. 2P) 



Dr Joseph Leidy* described, from the Triassic rocks of Star CauoD. 

 Humboldt county, and from Toiyabe Eauge uortlieast of Austin, Ne- 

 vada, Cymhospondylus petrinus, C. ^Ji^cosiis and Chonespondylus 

 grandis. And Prof. E. D. Cope, from Chatham county, North Carolina, 

 the batrachian Pariostegus niyops. 



In 1869, T. A. Conradf referred the clays on the Raritan river, in 

 New Jerse}^ which are found at the base of the Cretaceous, to the 

 Triassic, and described Podozamites proximus and Paloeocypris tri- 

 nodiferus. He described from South river,J New Jersey, Astarte veta, 

 and A. annosa, and from Perkiomen Creek, Pa.,§ Solenomya triasina. 



Prof. E. D. Cope,! from the Triassic at Phoenixville, on the Schuyl- 

 kill river. Pa., the Saurian Belodon leptnriis. 



In 1870, W. M. (Tabb^ described, from New Pass, near Austin, and 

 in the slates of Star Canon, Cardinia ponderosa, Posidonomya hlatch- 

 leyi, Cassianella Ungulata and 3Ionotis circularis. And from the 

 Jurassic of the mining district of Volcano, in Nevada, Ammonites ne- 

 vadensis, Turbo regius, T. elevatus, Pholadomya muUiUneata, P. 

 nevadana., Goniomya apeita, Cardium arciformis^ Astarte appressa, 

 Plicatula perimhricata, and Spirifera ohtiisa; and from the slates on 

 the west slope of the Sierra Nevada, near CoMixs., Ammonites coif axi. 



In 1871, Prof. J. W. Dawson** described from the Trias of Prince 

 Edward Island, Dadoxylon edv'irdanum and Cycadoidea abequidensis. 



In 1872,f f he said the Trias of Prince Edward Island is represented 

 principally by bright red sandstone, sometimes mottled with white and 

 associated occasionally with beds of gray and white sandstone. Sub- 

 ordinate to these sandstones are beds pf red and mottled clay, of red- 

 dish concretionary and conglomerate limestone, sometimes dolomitic 

 and of reddish conglomerate with quartz pebbles and arenaceous 



-'■• Proc. Acad. Nat Sci. 



t Am. Journal Sci. and Arts, 2d series, vol. 47, 



I Am, Jour. Conch., vol. 4. 

 § Am. Jour. Conch., vol. 5. 



II Trans. Am. Phil. Soc. 



H Am. Jour. Conch., vol. 5. 

 ■*■'■ Report on Prince Edvrard Island, 

 tt Lond. Geo. Mag., vol. 9. 



