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.

97
large map will be more convincing than any detailed description of this
point.
I have yet to trace the seam south of the Hocking hills, between them
and the Marietta and Cincinnati Railroad, but I know it to extend a considerable distance south of Nelsonville. It dips below the Hocking river
not far from the mouth of Monday creek, but is reached by shafts at
various points as far down the Hocking as Salina and Chauncey. The
description of its southern extension will be reserved until after more
detailed examinations.
THICKNESS OF THE SEAM.
At Nelsonville and vicinity the coal measures from six feet to six feet
four inches. The following are measured sections of the coal at the wellknown mines of W. B. Brooks, Esq., and of Peter Hayden, Esq. Sec. A
is that of Mr. Brooks, and Sec. B that of Mr. Hayden. (See Fig. 15.)
Shale
Shale.2 - to 5
3 to 4oo'
f^I=P 6 )/41 Coal 92 b 644} Coal'
to' 1 1, to 2
1 (Sec. A) (Se. 1 3
li3F~ire Cclayire ay
(Sec. A.) (Sec. B.)
FIG. 15.
The partings are essentially the same, and the coals show the same
physical structure. The partings seen in the foregoing sections are generally found to characterize the seam throughout its whole extent.
On the land of S. B. Westenhaver, Green township, Hocking county,
near the north-western out-crop of the seam, the coal was a trifle thinner,
measuring in total thickness five feet seven inches. Here the seam shows
its usual subdivisions. The seam, in its northern and north-eastern extension, grows thicker.
At Straitsville, Salt Lick township, Perry county, the seam measures
eleven feet, and shows the following subdivisions, as seen at the McGinnis bank. (See Fig. 16.)
7-G. S.