STRATIGRAPHY 



629 



AVERAGE SECTION 



IN BR£MEN FIELDS, 



CENTRAL OHIO 



AVERAGE SECTION AVERAGE SECTION 



IN SOUTHWESTERN PENNSYLVANIA WHERE THE FORMATIONS OUTCROP, 



AND NORTHERN WEST VIRGINIA IN EASTERN WEST VIRGINIA 



Blackwater Sandsto i 



-5000 53=e:^ 



1000' 

 Mauch Chunk 

 Red Shale 



Greenbrier Limesto 



3000- 

 Catskill Formation 



Jennings Formation 

 6000 



Romney Shale 



Monterey Sandston 

 9000' 



Lewistown Limesto 

 10,000- 



Rockwood Formation 



11,000- 

 Cacapon Sandstone 



Tuscarora Quartzite 



12,000- 

 Juniata Formation 



13,000- 

 Martinsburg Shale 



14,000- 

 Shenandoah 

 Limestone 



CORRELATION OF STRATA FROM WEST TO EAST 



SHOWING CHANGE IN THICKNESS 



Figure 3. — Comparative stratigraphic Columns of Ohio, West Virginia, and Pennsylvania 



(After F. G. Clapp) 



