170 



THE CARBONIFEROUS SYSTEM. 



Coal-group 23. 



(Sandstone and shale, witli one erect tree and two 

 underclays) ....... 



' Coaly and gray shale. 

 Coal and coaly shale, 4 inches. 

 Bituminous limestone, 4 inches. 

 Coal and coaly shale, 7 inches .... 



Argillo-arenaceous underclay, Stigmaria. 



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

 The shale and bituminous limestone contain Sigillaria and 

 Lepidophloios, also many large furrowed trunks, probably old 



Sigillaria or Lepidodendra. 



xn. 

 (Sandstone, shale, and calcareo-hituminous shale, 

 with three underclays) ..... 



( Calcareo-bituminous shale. 



Coal-group 24 -< Coal and coaly shale, 1 inch 



(^ Argillo-arenaceous underclay, Stigmaria. 



This bed was not exposed. 



(Underclay and shale) 



f Gray shale. 



Coal-group 25 -< Coal and coaly shale, 8 inches .... 



^Argillo-arenaceous underclay, Stigmaria. 



The roof has Alethopteris lonchitica, Cordaites, and petioles 



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



and Calamites. 



(Gray sandstone and shale, with erect Sigillaria; at 

 four or five levels, and two Stigmarian under- 

 clays) 



( Gray shale. 



Coal -group 26 -< Coaly shale, 4 inches 



( Argillo-arenaceous underclay, Stigmaria. 



This bed was not exposed. 



(Shale and sandstone, with Stigmaria) 

 f Gray shale. 



Coal-group 27 •< Coal, 3 inches .' 



( Argillo-arenaceous underclay, Stigmaria. 



This bed was not well exposed. 



ft. 

 12 



(Gray sandstone and shale, with bituminous shale 

 and limestone, and erect Calamites) . 



Coal-group 28. 



XI. 



f Calcareo-bituminous shale. 

 J 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 carbonarins and N. elongatits, also 

 Cythere and scales of fishes. The coal contains bast tissue 



13 







in. 

 



1 3 



117 8 



4 





 3 



64 



12 6 



