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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Near Roseville, Clay township, Muskingum county, an old coal-working
was found to be 80 feet above the Putnam Hill limestone. This is
the proper place for the Nelsonville or upper New Lexington coal. No
opportunity presented itself for measurement. The citizens of Roseville
believe that the lower seam is wanting in that neighborhood. It is possible that the soft shales' which generally overlie it, have become disintegrated, and slipped down over the out-crop and concealed it; but it may
be wanting altogether, as the seam is not always persistent.
In the high ridge in Licking county, which is called Flint Ridge, we
find near the top, and under the buhr or flint seam, a very thin coal
seam, only 6 inches thick, which is, from its stratigraphical position, the
equivalent of the Nelsonville coal. This gives us also the position of
the buhr stratum.
The flint or buhr stratum, on Flint Ridge, is not found to correspond in
stratigraphical position with the other layers of flint found in the district
especially examined. The flint in the valley of Rush creek, near New Lexington, Perry county, lies lower in the series, and the calcareo-silicious rock
of Dr. Hildreth, in the old Geological Report, found high on the hills in
Section 14, Clay township, Muskingum county, lies higher in the series,
as shown on the map of grouped sections. It was found difficult to
determine the exact stratigraphical position of the Flint Ridge buhr,
as it lies upon the top of the ridge, more like a blanket than like a rigid
stratum. It conforms more or less to the undulating surface of the
general top of the ridge, and is at some points many feet higher than at
others.
According to a measured section at Flint Ridge, made by Leo Lesquereux, Esq., and taken from the Kentucky report, there is a thin seam
of coal (6 in.) with fire clay (2 ft.) beneath, lying directly under the flint
or buhr. This coal has the stratigraphical position of the Nelsonville
or Straitsville coal, being 774 feet above the "Putnam Hill" lime stone,
which is found in unusual thickness above the cannel coal. This would
make the place of the buhr just over the Nelsonville coal.
The buhr is of variable thickness, its maximum being perhaps 8 feet.
Formerly, mill-stones were made from the rock, but the quarries have
been of late years abandoned. It is claimed that the purer portions of
the flint, when crushed, will serve a valuable purpose for glass making.
To the aboriginal inhabitants of the country, the layers of flint, interstratified with our coal measure rocks, were of the highest economic
importance, and much of the surface of Flint Ridge has been dug over
by them in order to obtain flint of the requisite quality.
These pits present a subject of great interest to all especially interested
in the study of the Mound Builders. The same energetic industry which
mark the building of the ancient earthworks of this mysterious race,
characterize their labors on Flint Ridge.