scholarly journals Chronostratigraphic correlation chart of the Pennsylvanian rocks in the Appalachian basin coal regions showing approximate position of coal beds, coal zones, and marker beds

Author(s):  
Leslie F. Ruppert ◽  
Michael H. Trippi ◽  
Ernie R. Slucher
10.1029/ft354 ◽  
1989 ◽  
Author(s):  
John M. Dennison ◽  
Edwin J. Anderson ◽  
Jack D. Beuthin ◽  
Edward Cotter ◽  
Richard J. Diecchio ◽  
...  

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