SOME FAUNAL REMAINS FROM THE TRIAS OF YORK COUNTY, 



PENNSYLVANIA. 



BY H. E. WANNER. 



Plants from the Trias of York County have been reported and 

 described under thirtj^-three species, twelve of which are new.' 

 In the same region, so productive of fossil flora, faunal remains 

 have been less in evidence. Only three species, all based on frag- 

 mentary saurian remains, have been described, two by Cope and 

 one by Sinclair."^ 



In the hope that a contribution to the knowledge of the faunal 

 life of this locality would be an acceptable addition to the palaeon- 

 tology of the Newark System, this paper is presented.* 



I am indebted to my father for inspiration and for whatever love 

 of the science of geology I possess. He materially assisted in the 

 field work and in the collection of specimens. I am also under obli- 

 gations to Dr. H. A. Pilsbry for counsel and assistance and for the 

 extension of every courtesy in granting me access to the data in 

 The Academy of Natural Sciences of Philadelphia; to him also 

 belongs the credit for the description and identification of the 

 Mollusca. Dr. John M. Clarke, of the New York State Museum, 

 kindly gave me the benefit of his mde knowledge in the consider- 

 ation of Spirorbis. 



Descriptive Geology. 



The Trias of York County rests, non-comformably, on the Lower 

 Cambrian.'* This is shown in the railroad cut just north of Emigs- 

 ville. The triassic rocks, dipping N. W. at an angle of 16 degrees, 

 rest on the Lower Cambrian shale and limestone. The latter dip 



1 Ehrenfeld, F. A study of the igneous rocks at York Haven and Stony 

 Brook, Pa. Univ. of Penna., 1898. Wanner, A. Triassic flora of York County, 

 Pa. U. S. Geol. Survey, Ann. Kept., pp. 233-2.55, 1898-99. 



^ Cope, E. D. Description of vertebrata from the Triassic formations of the 

 United States. Amer. Phil. Soc. Pr9c., vol. XVII, p. 232, 1878. Sinclair, W. J. 

 A large Parasuchian from the Triassic of Pennsylvania. Amer. Jour. Sci., 

 vol. XLV, pp. 457-462, June, 1918. 



' Most of the field work and the collection of material were done in the sum- 

 mer of 1920. 



* Walcott, C. D. The Cambrian rocks of Pennsylvania. U. S. Geol. Survey, 

 Bull. 134, 1892. 



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