212 NEW YORK STATE MUSEUM 



Dissemination of the subprovincial faunas in the Appalachian gulf. In 

 western Maryland (Allegany and Garrett counties) a meager represen- 

 tation of the fauna of the Naples subprovince occurs in dark and gray 

 shales, with some allied species which have not been observed in New 

 York. We have noted Buchiola retrostriata, B. livoniae, 

 B. conversa, B. mariae (not in New York), Paracardium deli- 

 catulum, P. doris, Pterochaeniafragilis,Lunulicardium 

 velatum, L. cymbula (not in New York), Bactrites aciculum, 

 Orthoceras filosum, Tornoceras uniangulare. 



The northward extent of this fauna along this southern edge of the 

 gulf has not been carefully studied though we know the presence of B u c h . 

 retrostriata and Pteroch. fragilis in the gray shales of Perry 

 county, Pa. 



The fauna of the Chautauqua subprovince has left no trace of itself 

 outside the region of its typical development. 



Comparisons of stratigraphic sections in the Genesee province 

 The tables herewith given serve to indicate the stratigraphic section 

 and its variations in three meridians of this province, one near the east 

 (Naples section), one at about the middle (Genesee river section), and one 

 at the west (Lake Erie section). These sections purport to represent, not 

 a given period of homogenous sedimentation, for the sediments are not 

 such, but the difference in duration of the Naples fauna with reference to 

 the total sedimentation. 



Naples section. We find at the top of the Genesee shale ' a thin layer 

 of gray flags and shale followed by 



Feet 



i Middlesex bituminous shales ------- 30 



2 Gray sandy shales and muds with thin sandstones and flags 



becoming thicker toward the top ------ 243 



These are the Cashaqua shales 



•This formation is properly to be classed with the Portage beds, as its fauna, so far as 

 distinctive, bears the first representation of the characteristic Naples congeries, but in 

 these sections we have reckoned from the top of the Genesee shales. 



