BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol, 25, pp. 277-320, PLS. 13-14 SEPTEMBER 1, 1914 



PROCEEDINGS OF THE PALEONTOLOGICAL SOCIETY 



MEDINA AND CATAEACT FOEMATIONS OF THE SILURIO OP 

 NEW YORK AND ONTARIO ^ 



(Presented in abstract before the Society December 30, 1912) 



BY CHARLES SCHUCPIERT 



CONTENTS 



Page 



Ijitroduction 278 



Part 1 278 



The Cataract formation 278 



(iJeueral discussion of the formation 278 



Upper Cataract or Cabots Head shale member 280 



Middle Cataract or Manitoulin limestone member 280 



Basal Cataract or Whirlpool sandstone 281 



The Cataract fauna 281 



The Medina formation 285 



The Medina fauna 288 



Relations of the Cataract to other Siluric faunas 290 



Species of the Cataract fauna 290 



Relation to the Medina 290 



Relation to the Brassfield 291 



Relation to the' Siluric of Anticosti 292 



Contacts between the Medina, Cataract, and Clinton 292 



Summary of sections 340 miles apart 296 



I'art II 297 



History of the Medina formation 297 



Amos Eaton 297 



T. A. Conrad 298 



James Hall 299 



C. A. Hartnagel 302 



A. W. Grabau 302 



■ Lardner Vanuxem 303 



The Siluric sections in detail from Rochester," New York, to the head 



of Lake Huron 304 



Rochester, New York, section 304 



Medina, New York, section 306 



Lockport, New York, section 307 



Niagara Gorge, New York-Ontario, section 308 



1 Manuscript received by the Secretary of the Geological Society March 17, 1914. 

 XX— Bull. Geol. See. Am., Vol. 25, 1913 (277) 



