ALLEGHENY FORMATION IN OHIO 123 



Pittsburg. It is not easy to correlate the higher beds, all of which are 

 below the tipper Freeport, but the bottom bed is very near the place of 

 the Brookville.* 



In Monroe, east from Noble, the available records are better than in 

 the counties referred to. This county, south from Belmont, extends 

 eastward from Noble to the Ohio river, there adjoining Wetzel and Tyler 

 counties of West Virginia. In the northwestern corner, within Summit 

 township, only 6 or 8 miles south from the Belmont line, a record shows 

 the Pittsburg present, though very thin. Sandstone begins at 453 feet 

 below that coal bed ; it is 45 feet thick and possibly is in part Mahoning. 

 A great sandstone, at top the Butler-Freeport, begins at 10 feet lower 

 and is almost continuous to 678 feet, where it overlies a coal bed, the 

 same with that seen about 20 miles to the southwest at 640 feet. The 

 Conemaugh thickens rapidly for a few miles from the western outcrop in 

 Guernsey and Muskingum and its bottom in this region is not far from 

 480 to 490 feet below the Pittsburg. The Brookville is recorded again 

 in Perry township, where, as in Summit, it is 350 feet above the Max- 

 ville or "Big limestone," but the interval to the Pittsburg is 705 feet, 

 showing an increase in the Conemaugh. The interval remains con- 

 stant for a considerable distance eastward, for in a well on the Ohio river 

 the Pittsburg is 1,050 feet above the Maxville; but the Brookville coal 

 is not recorded; that bed, however, is present beyond the river, in Tyler 

 county, at 704 feet below the Pittsburg, f 



Washington is south from Monroe and Noble and east from Morgan. 

 The intervals are greater here than on the western outcrop. At Macks- 

 burg, in the northern part of the county, toward the Morgan border, the 

 great sandstone below the Brookville is at 760 feet below the Meigs 

 (Macksburg) coal bed, but the Brookville coal is not recorded; all coals 

 seem to be wanting. The sand at the Butler-Freeport horizon is 78 feet 

 thick and is known locally as the Dunkard; its top is about 460 feet 

 below the place of the Pittsburg. Farther southeastward, in the Cow- 

 run region, one finds the Monroe interval again. At Macksburg the 

 Ames is about 190 feet below the Pittsburg; on Cowrun the exposures 

 make it about 230 feet. In the Centennial well on Cowrun the Brook- 

 ville is at 701 feet below the Pittsburg, with another coal at 63 feet 

 higher; near Macksburg the next coal is 65 feet above the Brookville. 

 The Allegheny shows in all only 66 feet of sandstone ; but it is worthy 

 of note that here, as in the West Virginia counties east from Washington, 



* J. A. Bownocker : Bulletin no. 1, p. 160. 

 -j- J. A. Bownocker : Bulletin no. 1, pp. 196, 212, 216. 

 I. C. White : Geology of West Virginia, vol. i, p. 356 ; vol. ii, p. 391. 



