CONTENTS. 
5 
Part II.—Detailed Descriptions. 
Page. 
Chapter I.—General stratigraphy.;. 67 
Introduction. 67 
Formations above the Pittsburg coal. 68 
Monongahela formation. 68 
Pittsburg coal and associated rocks. 68 
Redstone coal. 69 
Sewickley coal. 69 
Rocks between Sewickley and Uniontown coal beds. 69 
Uniontown coal. 70 
Waynesburg coal.’. 71 
Washington formation.. 71 
Waynesburg sandstone. 71 
Waynesburg “A 7 ’coal . 72 
Waynesburg “B 7 ’ coal and associated rocks. 72 
Little Washington coal. 72 
Washington sandstone. 72 
Washington coal... 73 
Lower Washington limestone and associated rocks. 73 
Middle Washington limestone. 74 
Upper Washington limestone. 75 
Greene formation. 76 
Upper Washington coal. 76 
Donley limestone. 77 
Sparta coal and associated rocks. 77 
Prosperity limestone. 77 
Dunkard coal and associated rocks. 78 
Claysville limestone and associated rocks. 78 
Nineveh coal and limestone. 78 
Formations below the Pittsburg coal. 79 
Conemaugh formation.1.. 79 
Interval between Pittsburg coal and Ames limestone. 79 
Ames limestone and coal beds. 79 
Cambridge limestone. 80 
Mahoning sandstone.. 80 
Allegheny formation. 80 
Finley coal. 80 
Roger (Upper Kittanning) coal. 81 
Middle Kittanning coal and associated rocks. 81 
Lower Kittanning coal and fire clay. 81 
Pottsville formation. 82 
Homewood sandstone. 82 
Mercer coal. 82 
Salt sand. 82 
Rocks below the Pottsville formation. 83 
Unconformity between the Mississippian and Pennsylvanian series 83 
Keener sand. 84 
Big Injun sand. 84 
Cuyahoga shale. 84 
Bitter Rock sand. 84 
Sunbury (“Berea”) shale.* 84 
Berea sand. 84 
Hundred-foot sand. 85 
