BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



VOL. 13, PP. 215-232 PLS. 29-39 JULY 29, 1902 



CORRELATION OF THE COAL MEASURES OF MARYLAND 



BY W. B. CLARK AND G. C. MARTIN 



(Read before the Society December SI, 190 T) 

 CONTENTS 



Page 



Introduction 216 



The formations and their equivalents 218 



Pottsville formation 218 



Composition and relations 218 



Basal contact 218 



Sharon sandstone 218 



Sharon coal 219 



Lower Connoquenessing sandstone : . . . . 219 



Quakertown coal 219 



Upper Connoquenessing sandstone 219 



Lower Mercer coal 219 



Mount Savage fire-clay 219 



Mount Savage or upper Mercer coal 220 



Homewood sandstone 220 



Allegheny formation , 220 



Composition and relations 220 



Brookville coal 220 



Clarion coal ■. 221 



Clarion sandstone 221 



Ferriferous limestone 221 



Kittanning sandstone 221 



" Split-six " coal 221 



Lower Kittanning coal 221 



Middle Kittanning coal 222 



Upper Kittanning coal 222 



Lower Freeport sandstone 222 



Lower Freeport limestone 222 



Lower Freeport coal 222 



Upper Freeport sandstone 222 



Upper Freeport limestone and Bolivar fire-clay 222 



Upper Freeport coal 222 



Conemaugh formation . ' 223 



Composition and relations 223 



Lower Mahoning sandstone 223 



XXXII— Bull. Geol. Soc. Am., Vol. 13, 1901 (215) 



