192 J. J. STEVENSON CARBONIFEROUS OF APPALACHIAN BASIN 



Where no numbers are given the well record is incomplete. In many 

 cases the sandstones alone are recorded. The coal bed, sometimes want- 

 ing and always very thin, is the Pittsburg. It is evident that the 'Tow- 

 run" is not the same bed in all of these wells. At the Summit locality 

 one is at little more than 12 miles northeast from the well in southern 

 Noble, where both Ames and Cambridge limestones are present and the 

 latter is about 300 feet below the Pittsburg. The interval from Pitts- 

 burg to the "Big Lime" in Monroe does not justify the supposition that 

 there is any notable thickening of the measures in this direction. Evi- 

 dently the sandstone beginning at 430 to 453 and ending at 480 to 485 

 is the Mahoning, which in the Summit well is continuous with the Alle- 

 gheny and in the Wayne well is continuous through the Allegheny into 

 the Pottsville. The Brookville coal bed at 678 and 705 feet will prove 

 to be a useful guide in Washington county.* 



The Hocking Valley coal field of Ohio embraces portions of Perry, 

 Hocking, and Athens counties along the western outcrop. Professor 

 Orton's generalized section for the lower portion of the Conemaugh in 

 the western part of these counties is : 



Feet. Inches 



1. Ames limestone 5 



2. Shale, red or drab 45 



3. Ewing limestone 3 



4. Shale, red or drab 40 



5. Cambridge limestone, black, in 2 benches 10 



6. Shale 25 



7. Mahoning ( ?) [Buffalo] sandstone 20 



8. Brush Creek coal 2 6 



9. Shale 15 



10. Brush Creek [Mahoning] limestone to 3 6 



11. Mahoning sandstone or shale 15 to 25 



the Cambridge limestone being 98 feet below the Ames and about 80 feet 

 above the Upper Freeport coal bed; but the variation is extreme in the 

 outlying areas of Perry and Hocking. At one locality in the former, 

 according to Professor Orton, the section begins with the Elk Lick coal 

 at 16 feet above the Ames and reaches to the Upper Freeport, giving in 

 all only 115 feet from Ames to Upper Freeport, all members of the sec- 

 tion being present, thus making less than 275 for the whole of the Cone- 

 maugh; but another section farther east in the same county shows the 

 Cambridge 94 feet 6 inches above the Upper Freeport and 52 feet above 

 the Brush Creek coal bed. The section in Hocking county covers the 



* J. A. Bownocker : Bulletin no. 1, pp. 201, 210, 212. 

 I. C. White : Geology of West Virginia, vol. i, p. 356. 



