BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



VOL. 20, PP. 427-606, PLS. 46-101 FEBRUARY 5, 1910 



PALEOGEOGEAPHY OF NORTH AMERICA 1 



BY CHARLES SCHUCHERT 



(Presented before the Society December 30, 1908) 

 CONTENTS 



Introduction 429 



History of paleogeography 431 



Detailed references 431 



Resume 436 



Methods of paleogeography 437 



Classification of methods 437 



Paleontologic method 437 



Basis of chronology 437 



Continental deposits ., 437 



Continental seas are shallow 438 



Fossils indicative of exact time 439 



Barriers 440 



Currents as fauna distributors 442 



Conclusions 445 



Areal-geologic method 446 



Petrologic method 446 



Diastrophic method '447 



Continental seas, or negative continental elements 447 



Paleozoic lands, or positive elements 464 



Displacements of the strand-line 475 



Emergences and transgressions 475 



Paleozoic emergences and submergences 479 



General discussion 479 



Attracted continental seas 480 



Synclinal continental seas 480 



Aggrading continental seas 480 



Transgressing continental seas 481 



Laurentide revolution 482 



Georgic period or system 482 



Acadic period or system 483 



Saint Croix transgression 483 



Franconia emergence 484 



Manuscript received by the Secretary of the Society September 7, 1909. 



XL — Bull. Geol. Soc. Am., Vol. 20, 1908 (427) 



