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.

80
in the samples shown me. Over the fire-clay is a seam of siderite ore in
nodules, imbedded in clay, as reported by Mr. Baird.
IMAXVILLE LIMESTONE.
There is above the Logan Sandstone group a limestone horizon, although the limestone is not everywhere persistent. It often gives place
to sandstone of the usual coal measure grit. It was evidently formed on
local basins occupied by quiet waters and cut off from the reach of the
strong, sand-moving currents. But as these limestones group themselves
upon one geological horizon, and always rest upon the top of the Logan
sandstone group, I have no doubt that they have the same geological
age, and were formed at the same time. I have called it the Maxville
limestone, from the village of that name in Monday creek township, in
Perry county, eight or ten miles north-east of Logan, where it has been
extensively burned into quicklime.
The following is a section of this limestone, as seen in the land of
James Tonnihill, Section 28, Green township, Hocking county. (See
Fig. 6.)
Soil
Yellow Shale
-^^-c —^^^. ~Thin layers Nodules of tron ore
4. 42^~- -^^7 - ~ Limestone n thick Nodules
____ --- Blue Snale
2/' X -- - Buff Limestone
8' / Calcareous Clay
Green Silicious Matter
^ ixed with upper layers
L,.^ H: ard Compact Limestone
-^' —1_ 1'B-'Bottom not Saeen bui near
FIG. 6.
Mr. G. W. Smith is engaged in quarrying and burning this limestone
at this place. He sells annually from 2,000 to 3,000 bushels of lime.
The stone is also used as a flux at the Union Furnace. Mr. Smith knows
nothing of the limestone west, nor, indeed, in any direction except to:he
north. It appears continuously northward for half a mile, and then is
NOTE.-The calcareous clay in above section is 8 inches thick, not 8 feet, as given.