DELAWARE COUNTY. 283 
outcrops on the west side of the Olentangy, but that stream lies, almost 
without exception, along the western edge of the black slate or of the 
shale underlying. Alum Creek, and nearly all of its small tributaries, 
afford frequent sections of the Huron shale; but they are so unconnected, . 
and have so great a resemblance one to the other, that they can not be 
correlated. Hence no correct statement of the thickness of this shale 
can be given. It has been estimated at about 300 feet. 
It would be impossible to mention every point at which this shale is 
exposed in Delaware county; hence only those outcrops will be noted at 
which some features are disclosed which throw lhght on the general 
character of the formation. 
In the bank of the Hast Branch of the Olentangy, near the center of 
section 1, Marlborough township, at Kline’s factory, the following section, 
in descending order, was taken. It belongs te the lowest part of the 
Huron : 
SECTION AT King’s Factory. 
No. 1. Thin, bituminous and brittle, similar to the exposure at 
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‘‘ 2. Blue shale; calcareous, hard and compact, parting con- 
choidally ; less hard and enduring than limestone; con- 
cretionary, irregular and bilging; seen in the bed of the 
river; this may not be a constant layer; seen............... 6 in. 
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Thirty or forty rods below the bridge over the Olentangy, just below 
the union of the Hast and West Branches, Troy township, the same hori- 
zon is exposed in the left bank of the river, on Jos. Cole’s land, covering, 
however, more of both numbers, as follows: 
SECTION IN Huron SHALE on Jos. Contn’s Lanp, Troy Townsuip. 
No. 1. Black slate, the weathered surface of which is divided 
into very thin beds; includes two beds, of an inch or 
two each, of less bituminous shale, which is blue, if 
damp, but brown: when dry and rusted..................... 23 ft. 
* 2. Blue shale, yet in regular, thin bedding.....................« 6 in. 
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‘“ 6. Massive blue shale, weathering out superficially in small 
rounded pieces or short cylinders, the upper ends of 
which are convex and the lower concave, the equiva- 
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