Portage Stages of New York. 



227 



White quarry. The zone is called the Paracijclas lirata stage 

 of the Hamilton fauna and its stratigraphic position was shown 

 by Dr. Williams in 1885.* A list of these species with their 

 geologic range is given below. 





Fauna of Conrad's " Oneonta group " 

 at Oneonta, New York. 



Geologic Stage.f 





ft 

 1 



m 







2 





 



a 



3 



X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 



p) 



S-l 

 <D 



to ++" 



os v 



O £>H 



£ 



l a 



03 



w 



4 



X 

 X 

 X 

 X 

 X 

 X 



X 

 X 

 X 



TJOZ 



9 



a, 





 5 



X 



03 

 



ZZ 



£ 



6 



X 

 X 



y 



p 





 

 p 







7 



X 

 X 



X 



X 

 X 

 X 



"" 



p 



C3 

 «}* 



£ 

 &>£ 



CO <( 



S-i 





 &h 



8 



X 

 X 



V 



X 

 X 



1 X 



a , 



CD * 



03 'ri 



z § 



5 § 



Ph 

 9 



X 



X 

 X 



X 



? 



X 

 X 



? 



X 





s. 



o 

 ■5 

 



Oh 

 oQ 







- 



5 



= 



List of Species. 



&0 



P 

 £ 







1 



Microdon (Cypricardella) bellistriata 

 (Con.) Hall 



10 



? 



Paracyclas lirata (Con.) Hall 









3 



Tropidoleptus carinatus (Con.) Hall 







X 



4 



Palceoneilo maxima (Con.) Hall 











Grammy sia magna Hall 









6 



Grammysia bisulcata (Con.) Hall 











Cimitaria recurva (Con.) Hall (?) 









8 



9 



10 



IT 



Tellinojjsis subemarginata (Con.) Hall _. 

 Modiomorpha concentrica (Con.) Hall .. 



Spirifera mucronata (Con.) Bill 



Goniophora carinata (Con.) Hall 





X 





12 

 13 



Homcdonotus De Kayi (Green) Emm 



Xvcvlites triqueter Con 





X 



? 



X 

 X 

 X 

 X 

 X 

 X 



X 

 X 

 X 



X 



X 

 X 

 X 

 X 



X 



X 



v 



-- 



X 



X 



-- 



14 

 lfi 



Microdon {Cypricardella) gregarius Hall 

 Leptodesma Rogersi Hall _. 



" 



X 



lfi 



Leiopteria De Kayi Hall 









IT 



Orthonota undulata Con 









18 



Microdon (Cypricardella) complanatus 

 Hall _ 









19 



or, 



Pleurotomaria sulcomarginata Con 



Spirifera mesastrialis Hall 



X 



-- 



V 

























* Proc. Am. Assoc. Adv. Sci., vol. xxxiv, Chart of Meridional Sections of the 

 Upper Devonian deposits of New York, Pennsylvania and Ohio, Section X, A' ; 

 where the Paracyclas fauna (A 7 ), is shown immediately underlying the Oneonta 

 reds and grays, (F'). 



f The data used in showing the geologic range of the species in the above list 

 are derived principally from the various works of Professors Hall, H. S. Williams 

 and Prosser. The distribution is confined to New York and eastern Pennsyl- 

 vania which have been studied with such care that the evidence can be used 

 with considerable force in this correlation. The range of a portion of the species 

 reported from the Portage of eastern New York and Pennsylvania depends upon 

 lists of the author, which have not yet been published. The horizon of this 

 eastern fauna is clearly above the Hamilton, but we have not yet sufficient evi- 

 dence to attempt its correlation with the different zones of the Portage in central 

 and western New York. 



% The horizon of the species reported by Professor Hall, and some other authors, 

 from the Hamilton of eastern New York is believed to require further investiga- 

 tion. The writer has evidence showing that a portion of these localities really 



