A. F. FOERSTE 



in the beds containing fish-teeth in the Devonian of Kentucky 

 and Indiana. 



At the Whirl, 4 miles north of Bakerville, at the west end of 

 the bluff exposing the Camden bed, there is a cultivated field. 

 Almost directly east of the well and stable in the center of this 

 field, near the lower part of the hillside, Devonian corals are very 

 abundant. Species of Heliophyllum, and Blothrophyllum. occur 

 which closely resemble forms occurring in the Corniferous at the 

 Falls of the Ohio River, at Louisville, Ky. Various species of 

 Cystiphyllwn, Cyathophylbcm, and Cladopora also are found. In 

 addition to a very large form of Atrypa reticularis, 2i single specimen 

 of Reticitlaria fimbriata was present. The corals have been 

 loosened by residual decay from a bed of limestone, about 3 feet 

 thick. The top of this layer is formed by a darker, sandy layer, 

 varying from a mere film to a little over 2 inches in thickness. 

 This darker part resembles the darker layer at the top of the 

 Devonian limestone section at the bridge west of Pegram. It 

 contained a single, pointed fish bone, 45™"" long. This bed of 

 limestone, 3 feet thick, is believed to be of about the same age 

 as the Devonian limestone at Pegram. Both limestones are 

 correlated with the Jeffersonville limestone of Kentucky and 

 Indiana, which is the equivalent of the Corniferous or Onondaga 

 limestone of more eastern sections. 



The occurrence of the Onondaga limestone near Bakerville 

 suggests that it may be expected at other localities in western 

 Tennessee northwest of a line passing from Bakerville to 

 Lexington, 



14. The Devonian Black shale series. — The Chattanooga Black 

 shale decreases in thickness from the north central part of the 

 state southward and westward. Its thickness in the neighborhood 

 of Cumberland City cannot be determined with accuracy, but it 

 appears to reach at least 10 feet. At Montgomery's mill the 

 shale has a thickness of 6 feet 3 inches; at Centreville, of 4 feet 

 6 inches; at Dean's quarry, of 2 feet. In the neighborhood of 

 Linden the thickness varies between i and 6^ feet; at several 

 exposures east of Linden a thin layer of sandy rock occurs in the 

 shale, about i foot above its base. Along the Buffalo River it is 



