198 J. J. STEVENSON CARBONIFEROUS OF APPALACHIAN BASIN 



portant because the samples were carefully examined and tested when 

 brought up. Pomeroy is 6 miles east from the locality at which Pro- 

 fessor Andrews found the Ames' and Cambridge 147 and 236 feet below 

 the Pittsburg. In the boring, red rock 38 and 42 feet was found begin- 

 ning at 93 and 151 feet below the Pittsburg, the latter being the "Big 

 Ked" belonging above the Ames. A fossiliferous limestone at 285 is the 

 Cambridge, the interval being 47 feet greater than at the western locality. 

 The Cowrun sandstone overlying the Cambridge is coarse. The Mahon- 

 ing (Lower) sandstone is at 379 to 431 feet, a more or less pebbly rock, 

 while the great sandstone of the Alleghen}^ begins at 15 feet lower, as in 

 Newport township of Washington, and the Brookville coal bed is at 675 

 feet. Dark shale overlying limestone is reported directly under the 

 Mahoning and it may be the Upper Freeport, thus giving a little more 

 than 430 feet as the thickness of the Conemaugh — an increase of nearly 

 about 70 feet in six miles — while it is 50 feet less than in eastern Wash- 

 ington county and the interval from Pittsburg to Brookville is also 40 

 feet less. The boring does not reach to the "Big Lime," which, at a 

 point 6 miles southeast, is at 1,190 feet below the Pittsburg coal bed. At 

 Pomeroy one is 40 miles southwest from Marietta.* 



Passing over into Gallia county, extending along the Ohio river south 

 from Meigs and adjoining Mason county of West Virginia, one finds near 

 the western border an outlier of the Pittsburg coal bed with the Cam- 

 bridge limestone at 240 feet below it. This is in Perry township, 10 

 miles west from Gallipolis, on the Ohio, and 20 miles southwest from 

 Pomeroy. About 6 miles farther north, according to Professor Orton, 

 the limestone is again double, the interval between the divisions being 

 18 feet. At 57 feet below the Upper Cambridge is a coal blossom which 

 is 77 feet above the Upper Freeport, while at 28 feet above the latter is a 

 limestone, thus making the thickness of the Conemaugh about 375 feet — 

 an increase of about 25 feet over the average in Meigs. At about 5 miles 

 northwest from Gallipolis the Cambridge is 248 feet below the Pittsburg 

 (Pomeroy) coal bed and is, as in much of Meigs, a white limestone. The 

 Ewing limestone was seen, at about 4 miles west from Gallipolis, 183 feet 

 below the Pittsburg and underlying 20 feet of red shale. Another meas- 

 urement only 2 miles from Gallipolis shows the Cambridge at 200 feet 

 below the Jeffers coal, or about 250 feet below the Pittsburg, and red 

 shale 16 feet thick is at 30 feet above it. Two feet of limestone at 50 feet 

 above the Cambridge may represent the Ewing. The place of the Ames 



* E. B. Andrews : Vol. i, pp. 249, 250-253. 

 E. Orton : Vol. vi, p. 397. 

 E. Lovejoy : Vol. vl, p. 633. 



