BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 14, pp. 15-96 March 28, 1903 



LOWER CARBONIFEROUS OF THE APPALACHIAN BASIN 



BY JOHN J. STEVENSON 



{Presented before the Society July i, 1902) 



CONTENTS 



Page 



Introdaction 16 



The Pocono of Lesle)"^ ; Vespertine of liogers 17 



Distribution and characteristics of the rocks 17 



Nomenclature 17 



Tiie anthracite strip 18 



The Allegheny plateau 20 



The strip west from the front of the Allegheny plateau 21 



The western counties of Pennsylvania 24 



Along the northern and western outcrop in Ohio 26 



The eastern outcrops in the Virginias 27 



The Pocono under West Virginia 30 



The eastern outcrops in Tennessee and Alabama 35 



The western outcrops in Alabama, Tennessee, and Kentucky 36 



Geological relations of the Pocono 38 



The Mauch Chunk of Lesley ; Umbral of Rogers 45 



Distribution and characteristics of the rocks 45 



Range of the Mauch Cliunk 45 



The anthracite strip 45 



Eastern counties of the Allegheny plateau 48 



Western counties of Pennsylvania 53 



Northern and western outcrop in Ohio 54 



Eastern outcrop in Virginia and West Virginia 56 



West Virginia basin 58 



Along the eastern and southern outcrops 67 



Eastern outcrops in Tennessee 71 



Outcrops in Georgia. 



Eastern outcrops in Alabama 73 



Western outcrops in Alabama. . . 76 



Western outcrops in Tennessee 77 



W^estern outcrops in Kentucky 80 



The correlation 83 



Physical changes during the Mississippian 86 



The later Devonian 86 



The Logan 89 



The Tuscumbia 91 



The Maxville 93 



The Shenango 95 



III— Bur.L. Geol, Soc. Am., Vol. 14, 1902 (15) 



