216 CLARK AND MARTIN THE COAL MEASURES OF MARYLAND 



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Mahoning limestone 223 



Mahoning coal 223 



Upper Mahoning sandstone 223 



Masontown coal . . V . . . 224 



Lower Cambridge limestone . . . . 224 



Buffalo sandstone 224 



Upper Cambridge limestone 224 



Lower red shales 224 



Bakerstown coal 225 



Saltsburg sandstone 225 



Crinoidal coal 225 



Ames or Crinoidal limestone 225 



Elklick coal 226 



Morgan town sandstone 226 



Clarksburg limestone 226 



Franklin or Little Clarksburg coal 226 



Connellsville sandstone 226 



Lower Pittsburg limestone 226 



Little Pittsburg coal 226 



Monongahela formation 226 



Composition and relations 226 



Pittsburg coal 227 



Eedstone limestone , 228 



Redstone coal ' 228 



Sewickley limestone 228 



Lower Sewickley coal 228 



Upper Sewickley or Tyson coal 229 



Sewickley sandstone 229 



Uniontown coal 229 



Uniontown sandstone 229 



Waynesburg limestone 229 



Waynesburg coal 229 



Dunkard formation 230 



Composition and relations 230 



"Waynesburg sandstone 230 



Waynesburg "A" coal 230 



Washington coal 230 



Upper Washington limestone 230 



Jollytown coal 23 L 



Jollytown limestone 231 



Conclusions 231 



Introduction 



The Coal Measures of Maryland have frequently been considered by 

 geologists independently of the deposits of the same age in the adjacent 



