WILLIAMS.] 



Stevenson's classification. 



107 



MIDDLE COAL MEASUKES. 



Synonyms* 



Pennsylvania, XIII in part, Alleghany River series \ Lower Barren group ... . >XIV. 



& / Lower Productive group ( XIII. 



( XIV ) 

 Virginia < vttt (Middle Coal Measures. 



qi . ? Barren Measures. 



S Lower Coal Measures in part. 



Indiana } T ri , ,, 



,j. - /Lower Coal Measures. 



j ? Middle Coal Measures. 



' ~ ) Lower Coal Measures in part. 



Michigan * Coal Measures. 



Mississippi ^ 



t— :::::::::::::::::: f Coal M««n«.in P «t. 



M issouri J 



Western region Upper Carbonic in part, Carbonic in part. 



Nova Scotia 



New Brunswick )> Middle Coal formation. 



Newfoundland 



LOWER COAL MEASURES. 



Synonyms and local subdivisions. 



Pennsylvania, XII, Serai Conglomerate, Pottsville Conglomerate, Umbral in part. 

 Virginia and West Virginia, XII, Quinnimont group Lower Coal Measures. 

 Ohio Lower Coal Measures in part. 



Illinois 1 [ Conglomerate or Millstone grit. 



Michigan Parma Conglomerate. 



Alabama | 



x=r :::::::::::::::: f c -' M <™ .-?»*• 



Missouri J 



Nova Scotia ) 



New Brunswick > Millstone grit formation. 



Newfoundland ) 



