90 : ANNUAL REPORT 
be worked it would have to be won by underground mining. The Clinton 
limestone is to be found in Preble, Montgomery, Clark, Miami, Greene, 
Clinton, Highland, Warren and Adams counties. (See table II at end of 
chapter. ) | 
Corniferous.—One sample taken from the Corniferous at White 
House, Lucas county, showed 7 feet of the top rock to be of a desirable 
composition. This is a crystalline rock, which is a mass of fossils. The 
stripping was not excessive here. An analysis made by Lord* of the cap 
rock at the ‘Kelly Island quarries showed a similar composition. The 
known localities on the Corniferous horizon where suitable rock can be ob- 
tained in quantity sufficient to form the basis of a large cement industry 
are not abundant. While the lower 4o feet of the Marble Cliff quarries 
near Columbus gives only 6.06 magnesium carbonate, and it is probable 
that many layers could be sorted out that would be low enough for Port- 
land cement, it would probably not be profitable to work them for this 
purpose. It is valuable for furnace flux as it is, and the cost of careful 
sorting would be considerable, so that the more particular use would be 
at a disadvantage. (See table III, at end of chapter.) 
Maxville—The first of the Coal Measure limestones met in ascending 
the geological scale is the so-called Maxville limestone, which lies at the ~ 
very base of the coal measures, or on the top of the Sub-Carboniferous. 
The area of the State covered by this stone is not large, nor is its pres- ‘ 
ence at all regular, or constant, over areas in which it does sometimes 
appear. It appears to have been deposited in lakes or ponds of limited 
area. So far as known, this does not overlie the Sharon or No. I coal, 
but rather appears to come in areas where the coal is wanting. 
This limestone is found in parts of Hocking, Perry, Muskingum and 
Licking counties. A line drawn from Logan to Mt. Perry, nearly north 
and south, would serve as the axis for the known exposures. The 
furthest point south is 2% miles below Logan. The furthest north is at 
Glenford. The largest body of the stone is at Fultonham and White 
Cottage, where it thickens up enormously for a small area, and becomes 
40 or 50 feet thick. Unfortunately, only the top 15 to 20 feet are above 
drainage at this point. 7 
The quality of the stone is variable. It is occasionally very pure, and 
free from magnesium carbonate, and eminently suited to cement manu- 
facture. In other places, it is magnesian and worthless. In some places, 
the stone is composed of some strata suited, and others not suited, to 
cement manufacture. In such cases, the present analyses are not con- 
clusive, as they represent the average or cross-section of the whole bed. 
(See table No. IV at end of chapter.) 
Mercer.—The next limestones encountered in ascending the scale 
are the Mercer, Lower and Upper. These stones are usually thin; they 
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*Geological Survey of Ohio, Vol. VI. 
