BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol. 30, pp. 339-378, PLS. 11-13 SEPTEMBER 30, 1919 



GEOLOGY AND STEATIGEAPHY OF THE AEEA OF PALEO- 

 ZOIC EOCKS IN THE VICINITY OF HUDSON 

 AND JAMES BAYS ^ 



BY T. E. SAVAGE AND PRAXCIS M. VAN TUYL 



{Presented before the Society December 29, 1916) 



CONTENTS 



Page 



Introduction 340 



Classification of Paleozoic rocks of Hudson and James Bay region 341 



Ordovician rocks in tlie Hudson Baj^ region 342 



Location 342 



Earlier studies 342 



Present studies 343 



Ordovician ^deposits exposed on Nelson River 344 



Nelson River limestone 344 



Shammattawa limestone along Nelson River 345 



Port Nelson limestone along Nelson River 345 



Detailed section of Paleozoic strata exposed along Nelson River 346 



Correlation of Nelson River limestone 348 



Ordovician rocks exposed on Shammattawa River , 349 



Section of rocks exposed on Shammattawa River 349 



Correlation of the Shammattawa limestone 352 



Silurian rocks in the Hudson Bay region 353 



Earlier studies 353 



Present studies 355 



Detailed section of strata exposed along Severn River 356 



Winisk River section 360 



Section of rocks exposed along Winisk and Shammattawa rivers 361 



Ekwan River section 353 



Correlation of the Silurian formations of the Hudson Bay region. . . . 367 



In general 357 



Port Nelson limestone 357 



Severn River limestone 367 



Ekwan River limestone 367 



Attawapiskat coral reef 368 



Devonian rocks in the Hudson and James Bay region 37O 



Earlier studies 37O 



Structure of the strata 372 



^ Manuscript received by the Secretar3' of the Society October 24, 1918 



XXIV — Bull. Geol. Soc. A.m., Vol. 30, 1918 (339) 



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