128 GEOLOGY OF OHIO. 
A section embracing not only the coal seams, but all the main 
elements of the Lower Coal Measures of the State, is given below: 
MaHonina SANDSTONE—CONGLOMERATIC, MASSIVE. 
Upper Freeport coal and blackband ore of Tuscarawas, etc. 
a clay or Bolivar clay. 
limestone. 
shale or sandstone. 
Lower Freeport coal. 
rf limestone, 
sandstone, conglomeratic; sometimes shale. 
Middle Kittanning coal. 
Shale and kidney ore. 
Kittanning sandstone. 
Lower Kittanning coal. 
Kittanning clay—Mineral Point. 
(Shale and sandstone). 
Ferriferous limestone and ore. 
Clarion coal, Upper or Scrub Grass. 
Sandstone—Hecla. 
Putnam Hill limestone. 
Brookville coal. 
Sandstone or shale—Tionesta. 
Tionesta coal. 
Upper Mercer limestone or flint, with ore. 
Upper Mercer coal. 
Shale. 
Lower Mercer limestone and ore. 
Lower Mercer coal. 
Sandstone—Massillon ; upper division. 
Quakertown coal. 
Sandstone—Massillon, conglomeratic. 
Sharon or Brier Hill Coal, with Mahoning blackband. 
Sharon Conglomerate. 
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