170 



THE CARBONIFEROUS SYSTEM. 



(Sandstone and shale, with one erect tree and two 

 underclays) ....... 



' Coaly and gray shale. 

 Coal and coaly shale, 4 inches. 



Coal-group 23 \ Bituminous limestone, 4 inches. 



Coal and coaly shale, 7 inches .... 

 Argillo-arenaceous underclay, St'igmaria. 



The roof has an erect tree, also Cordaites and Spirorbis. 

 The shale and bituminous limestone contain Siglllaria and 

 Lepidophloios^ also many large furrowed trunks, probably old 

 Shgillarice or Lepidodendra. 



XII. 



(Sandstone, shale, and calcareo-bituminous shale, 

 with three underclays) ..... 



( Calcai'eo bituminous shale. 



Coal- group 24 •< C'oaZ and coaly shale, 1 inch ..... 



{ Argillo-arenaceous underclay, Stigmaria. 



This bed was not exposed. 



(Underclay and shale) ...... 



( Gray shale. 



Coal-group 25 -; Coa? and coaly shale, 8 inches .... 



(^ Argillo-arenaceous underclay, Stigmaria, 



The roof has Alethopteris loiichitica, Cordaites, and petioles 



of ferns. The coal shows bast tissue and remains of Sigillaria 



and Calamites. 



(Gray sandstone and shale, with erect Sigillarite at 

 four or five levels, and two Stigmarian under- 

 clays) ......... 



C Gray shale. 



Coal -group 26 -< CoaZ?/ shale, 4 inches 



( Argillo-arenaceous underclay, Stigmaria. 



This bed was not exposed. 



(Shale and sandstone, with Stigmaria) 

 TGray shale. 



Coal-group 27 < Coal, 3 inches ....... 



( Argillo-arenaceous underclay, Stigmaria. 



This bed was not well exposed. 



(Gray sandstone and shale, with bituminous shale 

 and limestone, and erect Calamites) . 



XI. 



r Calcareo-bituminous shale. 



Coal and coaly shale, 7 feet. 

 J Underclay, Stigmaria, 4 feet. 

 Coaly shale, 1 foot. 

 Coal, 6 inches ....... 



Arenaceous underclay, Stigmaria. 



This group is a series of thin coaly layers and underclays. 

 The roof has Naiadites carhonarius and N. elongatus, also 

 Cythere and scales of fishes. The coal contains bast tissue 



ft. 



12 



in. 







1 3 



Coal-group 28. 



64 



12 6 



