96 GEOLOGY OF OHIO. 
coal, are proverbially unreliable as evidences of the succession of coal 
strata, but in the gas well, and at McGiluray’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 struek 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 anda stratum of limestone. 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 mollusks 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 Collinwood 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 Collinwood, 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 was 
deeply eroded before the deposition of No. 6. 
Coal: No. 6 is generally covered with a black shale a foot in thickness 
