BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



VOL. 11, PP. 347-376, PLS. 21-22 MAY 26, 1900 



SILURO-DEVONIC CONTACT IN ERIE COUNTY, NEW YORK 



BY AMADEUS W. GRABAU * 



{Read before the Society December 28, 1899) 



CONTENTS 



Page 



Introduction 348 



Upper Silurian rocks of Erie county 349 



Salina beds 349 



Rondout Waterlime , 349 



Manlius limestone 350 



Occurrence and general character , . . 350 



Faunal relations 351 



Westward extension of the Manlius limestone 352 



The contact in Erie county . 355 



Unconformity 355 



A sandstone dike 357 



Devonic rocks adjoining the contact in Erie county 361 



Oriskany representative 361 



Onondaga limestone 362 



Stratigraphic summary 363 



Synopsis of the organic remains in the Manlius limestone of Erie county 363 



Nematophyton crasmm Penhallow 363 



Oyathophyllum liydraulicum Simpson 364 



Orthothetes hydraulicus (Whitfield) 365 



Spirifer eriensis, sp. nov 366 



Whitfieldella sulcata (Vanuxem) 367 



Whitfieldella cf. rotundata ( Whitfield) 368 



Whitfieldella cf. Ixvis ( Whitfield) 369 



Rhynchonelloid 370 



Loxonema ? sp 370 



Pleurotomaria ? sp 370 



*I take pleasure in acknowledging the kindness of Professor John M. Clarke, who gave me 

 permission to study collections of Manlius and Coralline limestone fossils in the New York State 

 museum. Professor Clarke has independently discovered the unconformity in the contact in 

 Erie county, and has discussed its significance in a forthcoming memoir. He has also in repeated 

 discussions given me the full henefit of his critical knowledge of the horizons here described. It 

 should be stated that the general conclusions herein set forth have been arrived at independently 

 by both Professor Clarke and myself. The fossils described have been deposited in the State 

 collection at Albany. 



L— Bull. Geoi,. Soc. Am., Vol. 11, 1899 (347) 



