174 THE CARBONIFEROUS SYSTEM. 



The roof lias Stigmaria, also fish-scales, Naiadites, and 

 Cythere. The shales are pyritized. The coal shows only 

 obscure fragments of plants; but Sigillarice in the state of 

 ironstone occur in some of the clays. 



VIII. 



(Eed and gray sandstone and shale. Two under- ft- in- 

 clays. Many shells of Pupa vetusta and Conulus 

 priscus occur in one of these, ahout 42 feet below 

 the last coal) 83 



VII. 



f Calcareo-bituminous shale. 

 | Coal, 1 inch. 



Coal-group 38 ■{ Bituminous limestone, 6 inches. 



| Coal, 2 inches. 



(^ Underclay passing into chocolate shale, Stigmaria. 



The bituminous limestone and shale contain Cythere, Naia- 

 dltes elongatus and N. carbonarius, coprolites, Spirorbis, and 

 Stigmaria. The lower coal has Sigillaria elegans, S. scutel- 

 lata (?), 5. Brownii, Aletliopteris lonchitica, Cordaites borassi- 

 folia, and vascular bundles of ferns. 



VI. 



(Red and gray shales and sandstones, and one gray 

 limestone with Cythere. One underclay. Many 

 drift trunks, among which are Sigillaria and 

 Lepidophloios) . . . . . . . 123 6 



f Red and gray shale, with ironstone. 



p , „q J Coal, ^ inch 0^ 



a 'S 1-011 ? i Gray underclay, with Stigmaria, resting on bitu- 

 minous limestone, with Stigmaria and Cythere. 



This thin coal consists of a layer of flattened trunks, pro- 

 bably of Sigillaria, with a quantity of mineral charcoal. 



IV. 



(Red and gray shales. One bed with erect Catamites, 

 another with e.rect Sigillaria) . . . . 65 4 



III. 



' Gray shale and ironstone. 



Bituminous limestone and shale, with coaly films, 



7 inches. 



Underclay, 1 foot. 



Coal, 1 inch. 

 Coal-group 40 «{ ^ ^^ g incheg 



Underclay, 1 foot. 



Bituminous limestone, 6 inches. 



Coal and coaly shale, 2 inches . . . .37 



Argillaceous underclay, ironstone, and Stigmaria. 



