542 GEOLOGY OF OHIO, 
GEOLOGICAL STRUCTURE. 
The geological structure of the county is well illustrated by the general 
section on the opposite page. There is no county in the State where the 
exposures of the coals and limestone are more numerous, or where they 
can be traced from hill to hill with more certainty, and the intervals 
between them measured with greater precision, nor any which better 
illustrates the want of parallelism in the rock strata, unless it be perhaps 
the Great Vein Territory of Perry, Athens, and Hocking counties. 
The lowest rocks exposed in the county belong to the Waverly group, 
the ravines in places cutting down fully two hundred feet into this for- 
mation. It covers the greater part of Washington township, and on lot 
three the Lozier quarries furnish heavy stone of very fair quality, 
which is shipped for bridge-building and other purposes, to the adjoining 
counties. From twelve to fifteen feet of this quarry is composed of 
hard, fine stone, in layers varying from two to four feet, with from six 
to twelve inches of silicious iron ore at the bottom. The quarry is by 
barometrical measurement one hundred and seventy feet below the base 
of the thin deposit of conglomerate which caps the hill above, and the 
section here, compared with that of the first ravine directly south, illus- 
trates the topography of the county at the commencement of the depo- 
sition of the Coal Measure rocks. 
