96 GEOLOGY OF OHIO. 



coal, are proverbially unreliable as evidences of the succession of coal 

 strata, but in the gas well, and at McGiluraj^'s well, above Salineville, 

 two seams of coal are reported to have been passed through, which hold 

 about the proper position for Coals No. 3 and No. 4. Mr. James Farmer 

 reports that coal was passed through in the salt well bored by his father, 

 about one hundred feet below the third, or Roger seam of the Salineville 

 series, but as no record was kept, this report can not be regarded as cer- 

 tainly accurate. At Irondale Mr. Morgan found one foot of coal twenty- 

 five feet below the Creek Vein (Coal No. 3), which is apparently the lit- 

 tle coal seen at various points below, and at one hundred feet his boring 

 passed through another seam not over eight inches in thickness. No 

 coal was found below this. 



There are rumors of coal being struck in other borings made in the 

 valley, but no exact information has been attainable from this source. 



In the shales exposed in the cut at the summit above Salineville are 

 seen a thin seam of coal and a stratum of limestoae. These, with another 

 thin seam of coal shown in the neighboring hills, evidently belong to the 

 Barren Measures, and represent higher members of the series than the 

 coals worked at Salineville. 



Among the peculiar elements of the Salineville section, I should no- 

 tice a black, nodular limestone, containing many fossils, which is seen 

 above Coal No. 7, on Tidball's Run and at Hartford. It will be recog- 

 nized by its black color and the numerous white moUusks which it con- 

 tains. 



At New Salisbury and at Linton, a dark gray limestone, two feet in 

 thickness, shows itself under Coal No. 4. The interval between No 4 

 and No. 5 is composed mainly of shales, chiefly gray, and below the Roger 

 coal the limestone, which has been referred to, often divides the fire-clay. 

 At Yellow Creek Station it is two feet or more in thickness, and is highly 

 ferruginous; at CoUinwood it is said to have a thickness of seven feet; 

 at Hammondsville it is one and a half feet in thickness; at Deep Cut 

 from two to four feet, and is visible at Salineville. 



This is the most conspicuous limestone in the Yellow Creek series, but 

 it is an unreliable guide, since locally a limestone is found under each of 

 the coals. Under the Big Vein at Irondale and CoUinwood, just as in the 

 central and eastern portions of the county, a limestone occurs ; and under 

 No. 7 a limestone is conspicuously shown at Salineville and Linton. 



In the interval between Coals No. 5 and 6 we everywhere find more or 

 less micaceous sandstone and sandy gray shale. At Salineville this wae 

 deeply eroded before the deposition of No. 6. 



Coal No. 6 is generally covered with a black shale a foot in thickness 



