120 PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. [DoC. 20 



ironstone throughout. It rests on a bituminous limestone ft. in. 

 containing Naiadites and scales of fishes, and also large roots 

 of Stigmaria evidently in situ. This bed gives more colour 

 to the idea oi Stigmaria having grown underwater than any 

 other bed at the Joggins. I believe, however, that it merely 

 implies the drying-up of a pond or creek into a swamp, sub- 

 sequently inundated at intervals with muddy water. 



(Underclay and bituminous limestone, succeeded by 



sandstone and shale) 27 8 



r Grey shale. 



Coal-group 32... •< Coa^ and coaly shale 2 feet 4 inches 2 4 



[_ Argillo-arenaceous underclay, Stigmaria. 



This is a series of thin coaly bands alternating with shales. 

 The roof contains trunks of Sigillaria, Cordaites, Alethopteris, 

 and Cyperites, The coal has numerous flattened trunks of 

 Sigillaria. 



(Grrey and reddish sandstone and shale. Five under- 

 clays, one with a film of coal and erect Sigillarics 



attwolevels) 149 



r Coaly shale. 



Coal-group 33..."^ Coan inch , 1 



(_ Argillaceous underclay, Stigmaria. 



The roof has flattened trunks and vegetable fragments. 

 The coal is a mere soil, with remains of Sigillaria and Cor- 

 daites, and vascular bundles of ferns. 



(Ked and grey sandstone and shale) 45 



fGrey shale. 

 Coal and coaly and grey shale (underclay). 

 Argillaceous underclay, Stigmaria. 



These layers, though not of sufiicient importance to be 

 measured as coal-bands, are most interesting as furnishing 

 examples of what may be termed rudimentary coal-beds. 

 Each layer is plainly composed of prostrate trunks of Sigil- 

 laria resting on Stigmarian underclay, and mixed with Cor- 

 daites, Alethojpteris lonchitica, and vascular bundles of ferns. 

 In one layer is a stump in the state of mineral charcoal. 

 In another there are coprolites, scales of fishes, Spirorhis, 

 and fragments of Crustaceans. In a reddish shale above 

 these beds there is a patch of grey sandstone interlaced with 

 Stigmarian roots, as if the sand had been prevented from 

 drifting away by a tree or stump. 



(Eeddish and grey sandstones and shales, with three 

 or more underclays, having their coaly layers 

 holding Sigillaria. Erect Sigillarics at two levels) 246 



{Underclay, with ironstone and Stigmaria. 

 Coal and coaly shale 2 inches. 

 Underclay, with ironstone and Stigmaria, 4 feet. 

 CoaZ and coaly shale 2 inches ,,... 4 4 

 Argillo-arenaceous underclay, Stigmaria. 



Only obscure vegetable fragments were observed. 



(Grey and reddish sandstone and shale, with Stig- 



maria) 13 10 



