DELAWARE COUNTY. 293 



Beds the same as the Delaware stone. Mr. J. A. Clark's is half a mile 

 above Mr. Bieber's. 



Between two and three miles below Stratford the Lower Corniferous 

 appears on both sides of the river, and is described under the head of 

 Lower Corniferous. But about fifty rods still further down the right 

 bank, shows the Hamilton, or Upper Corniferous, again, having a thin 

 and almost slaty appearance as the edges of the layers are exposed in the 

 river bluff. In some parts these beds here are thickly crowded with 

 Spirifera, Cyrtia, and Strophomena; these, indeed, being the only conspicu- 

 ous fossils. These beds closely overlie the above mentioned Lower Corn- 

 iferous, although the superposition could not be discovered, showing the 

 continuance of Hamilton fossils well down into the Delaware stone. 



At a point about five miles and a half below Stratford, Mr. William 

 Case has a quarry on the left bluff of the river, in beds at the horizon of 

 the base of the Delaware stone. A little above this quarry a ravine 

 joins the river from the east, its sides affording a fine connected section 

 through the Olentangy shale, and the whole of the Delaware limestone, 

 into the Lower Corniferous. The shale and overlying Huron are seen in 

 ascending this ravine, about fifty rods from the river. Descending this 

 ravine, and including the rock exposed below Mr. Case's quarry, where a 

 very prominent bluff is formed by the erosion of the river, the following 

 succession of beds appears : 



Section Through the Olentangy Shale and Hamilton Limestone, Five and a 

 Half Miles below Stratford. 



No. 1. Black slate (Huron shale), seen 10 feet. 



" 2. Blue, or bluish-green, bedded shale ; non-fossiliferous, em- 

 bracing sometimes layers of black slate, like No. 1, of 3 or 

 4 inches in thiekness ; poorly exposed (Olentangy shale), 

 about 30 " 



*' 3. Bituminous, dark blue, or black limestone ; non-fossiliferous, 

 rather rough, hard, and with some black chert, or flint 

 (Tully limestone ?) 1 " 



" 4. Thin, blue, tough, finely crystalline beds, containing consid- 

 erable black chert, or flint, associated with pyrites ; in the 

 lower portion in beds of 4 to 16 inches; but little fossil- 

 iferous (Tully limestone?), about _ 8 " 



" 5. Beds 4 to 6 inches, slightly fossiliferous ; embracing some 

 bituminous, slaty shale in irregular deposits about crowded 

 concretions (Hamilton limestone?) 14 " 



u 6. Tough, bluish-gray, slaty beds of impure limestone, ef the 

 thickness of J to i an inch, with considerable chert 

 (Hamilton?) ...„ „.„ _ 8 " 



