| GEOLOGY OF OHIO. | 101 
ally thinning out, and, at the railroad bridge, having entirely disap- 
peared. 
At Mr. John Hayes’s upper mine (the Empire Coal Company) the coal 
worked is four to five feet below the railroad gerade. Forty-two feet below 
it two borings struck a seam of coal which measured, in one case, twenty- 
four, and, in another, twenty-seven inches. At the lower mine of Mr. 
Hayes, the coal worked lies above grade, is three to five feet in thickness, 
with a slate parting. It is hard and bright, but contains more sulphur 
than No. 7, at Salineville. Fifty-two feet below it a seam of coal, said 
to be five feet thick, was struck by Mr. Hayes, in a shaft. On Tidball’s 
Run Coal No. 7 has been worked by stripping in the bottom of the val- 
ley. It is three feet thick, but explorations made toward the east show 
that it thins out to one foot. Higher up Tidball’s Run, the Barren Meas- 
ures are seen overlying No. 7, and containing the black, nodular, fossilif- 
erous limestone, to which reference has already been made. 
In the point opposite the lower mine of Mr. Hayes, a coal seam was 
formerly worked, just above the water level. It here dips toward the 
north-east, and is unquestionably the same as that worked by Mr. Hayes. 
Forty feet above it, in the cliff, is a bastard limestone, over which is a 
fire-clay and a thin streak of coal which may represent No. 7. 
Further down the creek, near the mouth of Piney Run, a coal seam is 
seen in the cliff, twenty feet above Yellow Creek. It is three and a half 
to four feet in thickness, with a parting of slate one foot from the bot- 
tom—evidently the same seam as that mined by Mr. Hayes, and that 
once worked at the point above. Over the coal is a thin stratum of blue 
shale, then a sandstone, and a slope of one hundred feet where the rock 
is not well shown, but is apparently gray shale. Above this is a cliff of 
gray shale, and back from the creek the characteristic strata of the Bar- 
ren Measures. : 
In the interval between the lower mine of Mr. Hayes and New Salis- 
bury, the exposures of coal are now quite imperfect. Considerable min- 
ing was formerly done here, mostly for the supply of the salt works, but 
for some reason—probably because the coal seams do not here exhibit 
their best development—very little coal has been taken out for many 
years. | 
The coal worked at McGarry’s Bank is apparently No. 6, No. 5 being 
here below drainage, but said to have been reached in borings. 
At New Salisbury Coals No. 3, No. 4, No. 5, and No. 6 are shown, and 
we have the general section of the lower portion of the valley. 
At Irondale the entire series of coals may be recognized, and here are 
extensive mines, a furnace, rolling-mill, and an establishment for coal 
