Part I. Report of progress in 1869, by J. S. Newberry, chief geologist. Part II. Report of progress in the second district, by E. B. Andrews, assist. geologist. Part III. Report on geology of Montgomery County, by Edward Orton, assist. geologist.

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Should furnaces be erected in the immediate vicinity of the coal, limestone could be obtained from the "Maxville limestone" stratum at various accessible points. At Maxville, in Perry county, the limestone is
well developed. It is also found near Logan. In the Sunday creek valley a white limestone of excellent quality is found on the highest hills,
213 feet above the level of the great coal seam. Another limestone, more
earthy in character, but which would doubtless answer for a flux, is found
147 feet above the great seam. For furnaces located at Nelsonville, Haydenville, Logan, Straitsville, and other points on the Columbus & Hocking
Valley Railroad and its branches, limestone from the Corniferous beds at
Columbus could be used.
STRATA ABOVE THE NELSONVILLE SEAM OF COAL.
Having thus considered the "Nelsonville" seam of coal in its geographical range, its geological relations, its quantity, its quality, and its
adaptations, the way is prepared to notice in detail the rocks which lie
above it, so far as yet observed.
At Nelsonville, in the hill back of the village, we found the section as
follows. (See Fig. 20.)
6tto 7 )seen
/'b''-'..Sandrock Irregutarly^Bedded
tto 24"t Coat, Yerylrregular
3,,, Blue Clay' Shale:Bitumi nous Shale
2 elsonville Coat
Upper Part Seen
FIG. 20.
As a general rule, there are slates or shales immediately above the coal.
Somestimes the sandrock, which is very heavy, lies directly upon the coal,
although this, so far as we saw, was uncommon. In many places the
sandstone is itself gone, and its place taken by yellow shales, in which
we find coal seams. The changes from the sandrock to shales and back
again, are so sudden and unexpected, that it is not strange that much confusion has arisen. Generally alongithe Hocking river we find the heavy
sandrock separated from the coal by a few feet of clay shales. This
8-G. S.