BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 34. pp. 151-230 June so, 1923 



SITES AND NATURE OF THE NORTH AMERICAN 

 GEOSYNCLINES ^ 



PRESIDENTIAL ADDRESS BY CHARLES SCHUCHERT 



. {Read in part before the Society December 28, 1922) 



CONTENTS 



Page 



Introduction 152 



Rise of the theory of geosynclines 153 



General discussion 153 



Hall's theory of synclines and crustal folding 155 



Dana on geosynclines, synclinoria, and anticlinoria 156 



Two kinds of geosynclines in North America 157 



Borderlands of North America , 158 



General discussion 158 



Appalachia 160 



Acadia and Novascotica 162 



Cascadia 163 



Medial or nuclear area of North America 164 



General discussion 164 



Swells 165 



Geanticlines 166 



Dana's views 166 



Cincinnati geanticline 166 



New Brunswick geanticline 166 



Kinds of geanticlines 167 



Proterozoic geosynclines 168 



Development of the Appalachian geosyncline 170 



Geosynclines in general 170 



Embayments 171 



Greater Appalachian geosyncline 171 



Restricted Appalachian geosyncline . . . . : 172 



Saint Lawrence geosyncline 177 



Development of the Acadian geosyncline 179 



General discussion 179 



Northumberland basin ISO 



Development of the Ouachita embayment 181 



1 Manuscript received by tlie Secretary of the Society April 10. 1923. 

 This paper is one of a series composing a "Symposium on the structure and history 

 of mountains and the causes of their development." 



XI— Bull. Geol. Soc. Am., Vol. .34, 1922 (151) 



