3C0 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 3 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 Corniferous 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, in a 

 little ravine from the south, is Benjimin Bean's quarry. It is in the 

 fossiliferous member of the Lower Corniferous which underlies the Delhi 

 beds. It 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, lie 

 about, which belong to the Delhi beds and to the bluish stone directly 

 below them. About twenty rods still further clown, 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 : 



