BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 VOL. 24, PP. 399-528, PL. 12 SEPTEMBER 22, 1913 



EARLY PALEOZOIC DELTA DEPOSITS OF NORTH AMERICA 1 



BY AMADEUS W. GRABAU 



(Bead before the Society December 29, 1911) 



CONTENTS. 



Page 



Introduction 400 



River deposits 400 



Characters of the alluvial fan 4(01 



Current bedding of the alluvial fan deposits 4*01 



Structure of the marginal delta 404 



Fossils of deltas 405 



Overlap relations of deltas 405 



Coarseness of delta deposits 406 



Examples of ancient delta deposits from the Ordovicic and Siluric con- 

 glomerates and sandstones of the Appalachian Mountain Region 406 



In general 406 



The northern sections 407 



The southern sections 410 



The successive deposits in detail 410 



In general 410 



The Bald Eagle conglomerate 411 



Summary history of the Bald Eagle delta 428 



The Juniata and the Queenston red beds 430 



Probable extent of folding of the strata and subsequent erosion 442 



General discussion 442 



The Bays sandstone 446 



General results of studies made 446 



Section of the Bays-Sevier near Jacksboro, Tennessee 449 



Section on Clinch Mountain near Mendota, Virginia... 452 



The Bays of Big Walker Mountain, Virginia 453 



The East River Mountain section 45f> 



Summary of the Bays problem 458 



The Medina and the Tuscarora and Clinch formations and their 

 extension in eastern United States 45!) 



1 Revised manuscript received by the Secretary of the Society January 22. 1813. 

 This paper was presented before the Society on December 29, 1011, In Its entirety 

 under the title "Ancient Delta Deposits of America and Europe." It was awarded a 

 Walker prize by the Boston Society of Natural History In May, 1012. The present pair 

 has since been much enlarged by the addition of details. The general conclusions are, 

 however, the same. The fieldwork In the Appalachians was carried on under a grant 

 from the Esther Herrman Research Fund of the Scientific Alliance of New York (now 

 New York Academy of Sciences and affiliated societies). 



(399) 



