124 



PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. [DoC. 20, 



4 2 



1 



19 1 



Though, this group contains little coal, it is to be observed that it 

 has many underclays, indicating soils which supported forests of 

 jSigillaria, and that erect Bigillarice occur very near the base of the 

 division. The absence of important beds of coal is therefore due to 

 the local physical conditions, and not to the want of the necessary 

 vegetation. . 



(Sandstones and shales with many drifted trunks of ' ^^' 



I)adoxylo7i) 539 7 



'Blackish grey shale. 

 Calcareous shale 1 foot. 

 Coal-group 1 . . . < Black shale 3 feet. 



Coaly shale 2 inches 



^Argillo-arenaceous under clay, Stigmaria. 

 (Red and grey sandstone and shale and concretionary 

 limestone," trunks of Badoxylon and other trees. 

 One underclay) 160 



(G-rey shale. 

 Coaly shale 1 inch 

 Eeddish and grey underclay, Stigmaria. 

 (Series of underclays with Stigmaria. The beds a 



reddish or grey, and arenaceous) 



( Reddish shale. 

 Coaly shale 1 inch. 

 G-reenish shale 6 inches. 

 Coaly shale 1 inch. 

 Coal-group 3 . . . •{ Grreenish shale 2 feet 6 inches. 

 Coaly shale 3 inches. 

 Greenish shale 1 inch. 



Coal and coaly shale 3 inches 3 9 



^ Argillo-arenaceous vmderclay, Stigmaria. 



The coal contains bast tissue and reticulated, porous, and 

 scalariform tissues of Sigilla7na and Calamodendron. 



(Series of underclays as before) 12 



{Underclay, Stigmaria. 

 Coal and coaly shale 3 inches 3 

 Argillo-arenaceous underclay, Stigmaria. 

 (Series of underclays as before) 24 



(Grey shale. 

 Coaly matter ^ inch 

 Greenish underclay, Stigmaria. 

 (Underclay and sandstone, the latter with an erect 

 Sigillaria) 



(Sandstone (erect Sigillaria as above). 

 Coaly shale 3 inches 

 Argillo-arenaceous underclay, Stigmaria. 

 (Fifteen feet of underclay, under which a thick sand- 

 stone with great quantities of drifted trunks of Ba- 

 doxylon and Sigillaria. Below this alternations 



of grey and red sandstone and shale) 210 10 



/Grey sandstone. 

 Bituminous limestone 3 inches. 

 Grey shale 3 feet. 

 Grey limestone 2 inches. 

 Coal-group *7 .,.-{ Coaly shale 6 inches. 



Bituminous limestone 3 inches. 

 Coaly shale 1 foot. 



CoalX inch , ,,.,. 5 3 



^ Argillo-arenaceous underclay, Stigmaria. 



i 



10 

 3 



