174 THE CARBONIFEROUS SYSTEM. 



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

 Cyihere. The shales are pyritlzed. The coal shows only- 

 obscure fragments of plants ; but Sigillarice in the state of 

 ironstone occur in some of the clays. 



VIII. 



(Red and gray sandstone and shale. Two under- ft- >"• 

 clays. Many shells of Pupa vetusta and Conulus 

 prisons occur in one of these, about 42 feet below 

 the last coal) 83 



VII. 



f Calcareo-bitumiuous shale. 

 I Coal, 1 inch. 



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



I Coal, 2 inches. 



[^ Underclay passing into chocolate shale, Stigmaria. 



The bituminous limestone and shale contain Cythere^i Naia- 

 dites elongatus and N. carbo)iarius^ coprolites, Spirorbis, and 

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

 lata (?), S. Broi07iii, Alethopteris lonchitica, Cordaites horassi- 

 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 



V. 



r Red and gray shale, with ironstone. 



p , on } Coal, ^ inch 0^ 



coa -group -j Qj.ay 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 Calamites, 

 another with erect Sigillaria) . . . . G5 4 



HI. 



' Gray shale and ironstone. 



Bituminous limestone and shale, with coaly films, 



7 inches. 



Underclay, 1 foot. 



^ , ,r. Coal, 1 inch. 



Coal-group 40 ^ ^^^j^ ^^^^j^^ 3 .^^^^^^ 



Underclay, 1 foot. 



Bituminous limestone, 6 inches. 



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



Argillaceous underclay, ironstone, and Stigmaria. 



