416 INDEX TO THE STRATIGEAPHY OF NORTH AMERICA. 



gulf thus diminish southward toward the Mississippian sea. A typical section at 

 Vanceburg, Ky., is stated by Morse and Foerste as follows: 



, Section of Al%m Rock, Vanceburg. 



Ft. In. Teet. 

 5. Cuyahoga formation 39 



Interval covered except a thick layer of argillaceous sandstone at the top. The 

 sandstone contains Taonurus. Small phosphatic nodules are found in the 

 basal part of the interval. 



4. Sunbury shale, total thickness ISjJ- 



Black fissile carbonaceous shales, which can not be distinguished lithologically 

 from the Ohio shale. 



3. Berea grit, total thickness 22J 



Thick layer of gray sandstone 2 6 



Heavy layer of rather coarse grained gray sandstone, the upper surface excel- 

 lently ripple marked 3 



Medium to thick bedded, rather coarse grained gray sandstonesj beautifully 



ripple marked 15 



Arenaceous shales 1 



Layer of fairly coarse grained gray sandstone 9 



2. Bedford formation, total thickness 95| 



Blue arenaceous shales and shaly sandstones; lower part slightly covered 35 



Arenaceous shales with thin sandstone partings 7 



Layer of thick-bedded gray sandstone 1 8 



Arenaceous shales with two layers of sandstone 6 9 



Heavy layer of gray sandstone, with lower surface contorted 2 4 



Arenaceous shales with two layers of gray sandstone 6 6 



Layer of thick-bedded buff sandstone 1 9 



Medium-bedded gray sandstones with shaly partings '. 2 10 



Arenaceous pink shales with sandstone partings 2 6 



Covered interval 5 



Layer of thick-bedded buff sandstone 2 



Practically covered interval with some argillaceous shales 22 6 



1. Ohio shale 242 



Black fissile carbonaceous shales. About 10 feet from the top one or two lin- 

 guloid shells occur. Near the central part the shales become softer and 

 lighter in color and resemble a similar zone in the Ohio at Columbus (Ohio). 

 The interval (242 feet) is mostly exposed and extends to the level of the 

 Chesapeake & Ohio Railway. At "Slate Point," however, the top and 

 bottom contacts are shown and the total thickness is 301 J feet. 



At Petersville, Ky., southwest of Vanceburg, the Bedford and Berea are, 

 according to Morse and Foerste, no longer separable and have together a thickness 

 of 46i feet only. Several successive sections are cited by them. At Irvine, Ky., 

 southwest of PetersvUle, they measured the following: 



Section of Minerva Mountain, Irvine. 



Ft. In. Feet. 

 6. Subcarboniferous limestone 1 



Yellowish sandy-like limestone, lying at the extreme top of the hill. 



5. Upper Waverly series, not divided 344 



Covered interval 60 6 



Thin-bedded buff argillaceous sandstones, which weather to thin shaly pieces; 



Taonurus 17 



Layers of massive buff argillaceous sandstone, Taonuriis abundant 24 



Buff argillaceous sandstones, weathering to shales; Taonurus 17 



Covered interval 225 6 



4. Cuyahoga formation, top not determined 144 



Brownish ferruginous and calcareous nodular layer of sandstone 6 



Indurated bluish to pinkish argillaceous shales with ferruginous nodular layers. 69 6 

 Soft bluish argillaceous shale with ferruginous nodular layers, slightly covered 



(top of Linietta clay) 63 6 



Layer of brownish argillaceous sandstone, which breaks up into shaly layers. . . 2 

 Soft bluish to pinkish argillaceous shales and small phosphatic nodules 8 6 



