ALLEGHENY FORMATION IN OHIO 127 



the Brookville, and the increased interval as compared with 10 miles 

 farther west is in accord with what has been found all the way south- 

 ward, but the actual interval from the Pittsburg is probably barely 700 

 feet.* 



Returning to the western outcrop in Scioto, one finds the whole section 

 on the Lawrence border, where at Panther hill the thickness of the forma- 

 tion is barely 175 feet. At a few miles east, in northern Lawrence 

 county, Mr McMillin^ s section shows all of the coal beds present except 

 the Clarion and the total thickness is approximately 200 feet. The 

 Upper Freeport, in most of the region unimportant, reaches great de- 

 velopment in the Waterloo field of northern Lawrence and the adjacent 

 part of Gallia, where it was first correlated accurately by Mr McMillin. 

 It is a double bed, 5 to 6 feet thick. The Lower Freeport is persistent 

 within a broad strip of western Lawrence, where it is commonly about 

 4 feet thick and is known as the Hatcher bed. The Middle Kittanning 

 (Sheridan, Coal 6) is a "steady and excellent seam," usually more than 

 3 feet thick and yielding in many places an open burning coal. It is a 

 double bed, apparently without the lower or bottom bench of the Hock- 

 ing valley. The Lower Kittanning (Newcastle) is a good coal, 3 feet 

 6 inches thick in the western part of the county. The Clarion (Lime- 

 stone coal), underlying the Vanport, enters from the north as an im- 

 portant bed, but decreases quickly southward and eastward and disap- 

 pears, but the Brookville persists, though becoming thinner southward 

 and worthless throughout. 



Sections by Professor Orton, Doctor White, and Mr McMillin have 

 been measured on the Ohio at and above Ironton, on the southern border 

 of Lawrence county, which make the thickness of Allegheny 240 feet, 

 showing a notable increase in 12 miles southward. No sections have 

 been obtained along the easterly side of the county along the Ohio, as the 

 character of the surface prevents exposures; nor are there any well 

 records; but at Central City, in Cabell county of West Virginia, 10 or 12 

 miles southeast from Ironton and at the same distance from Mr McMil- 

 lin's measurements in northern Lawrence, a well record shows black slate 

 at 670 feet below the Pittsburg coal bed, with a limestone at 203 feet 

 above it. This is the relation of the Shawnee limestone and Brookville 

 coal farther west. The interval, Pittsburg to Brookville, is 630 at Iron- 

 ton, about 700 feet at Gallipolis, and in each case, as here, the great 

 sandstone of the Pottsville begins below the coal. The black shale at 



* E. Orton : Vol. v, pp. 1028, 1049-1050. 

 I. C. White : Geology of West Virginia, vol. i, p. 273. 

 J. A. Bownocker : Bulletin no. 1, p. 279. 



