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Geology—Mineral District.

114

Limestone" and which constitutes the hills surrounding
the City of Cincinnati [and which]. It is considered by most geologists as the equivalent
of the "Trenton Limestone" of the New York Geologists, but
which Mr. Halls thinks it belongs too a more recent period.
All the rocks of this District are referable to the "Champaign
Division," which is the first or oldest of the transition rocks
in the United States.

III. The third Geological District is that [what is] known,
(and very properly,) [known] as the "Mineral County"
the word mineral being used here to denote
an ore of some useful metal. The lead bearing rock
is a loose porous yellowish limestone, resting upon the
"Blue Limestone" and is deemed equivalent to the "Cliff
Limestone" of Dr. Locke in Ohio, and the "Niagara Limestone"
of the New York Geologists. The boundaries of this
District according to Dr Owen [runs] nearly parallel with
and [the Wisconsin] a few miles south of the Wisconsin, from the Mississippi
to the Blue Mounds + thence down the Sugar
[rivers] nearly to the south line of the Territory, where

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