300 GEOLOGY OF OHIO. 
No: 1 (above) is the equivalent of No. 4 of the section at Colvin’s 
lime-kilns. The bluish beds which these overlie probably are in some 
instances very fossiliferous, and are then undistinguishable from this. 
It seems as if this member may have either character, namely, almost 
non-fossiliferous, bluish, or exceedingly crowded with corals, and charged with 
bituminous matter in the form of films, scales, and unequal deposits between 
the beds, the horizons being identical. When the blue color permeates 
the upper portion, without fossils, it seems to be due to an even dissemi- 
nation of bituminous particles, in fine subdivision, through the waters 
giving the calcareous sediment, the well-preserved corals and other fos- 
sils being restricted to certain localities. No. 2 of this section embraces 
Nos. 2 and 8 of the section at the south county line in the east bank of 
the Scioto. The thin, cherty layers are not so well defined as usual, and 
the thickness of both is somewhat reduced. This is here all a good 
building stone, almost free from chert. 
At a point two miles west of the Scioto, ascending Mill Creek, the 
Lower Cornifcerous disappears entirely, the Waterlime appearing at the 
surface. The general surface features do not indicate the change, the 
whole being eroded by creeks, and made rolling or undulating. The 
Drift is faded, the rock shattered, and deeply penetrated by infiltration 
of dirt. The boundary line between the Lower Corniferous and the 
Waterlime passes through Priestley Said’s farm, where there are little 
quarries in both. | 
South from Ostrander one mile, on the south side of Mill Creek, ina 
little ravine from the south, is Benjamin Bean’s quarry. It is in the 
fossiliferous member of the Lower Corniferous which underlies the Delhi 
beds. Jt embraces many corals and some brachiopods. It is probably 
the equivalent of No. 4 of the section at Colvin’s lime-kilns, already 
given. Hence the formation shows a dip back to the west, leaving but 
a narrow belt of Waterlime. Passing down Mill Creek from the bridge 
near Bean’s quarry a quarter of a mile, no rock is visible in the banks, 
which are of Drift and about fifteen feet high. Fragments, however, le 
about, which belong to the Delhi beds and to the bluish stone directly 
below them. About twenty rods still further down, the Waterlime ap- 
pears in the bed of the creek. 
The Delhi beds are exposed in the banks of the Olentangy about two 
and a half miles below Stratford, with a dip to the north. The rock 
here appears massive, but under long exposure parts into beds of one 
to three inches. It is crinoidal and crumbling. The bluff seems to be 
separable into two parts, as follows: 
