164 



THE CARBONIFEROUS SYSTEM. 



parting has erect stumps, apparently of Sigillaria. The upper 

 shales and coals are very pyritous, and decompose when exposed 

 to the "weather — an indication that sea- water had access to these 

 beds while the vegetable matter was still recent. 



XXVI. 



ft. in. 



Coal-group 5 



[(Gray argillaceous sandstone and red and gray shale, 

 with two Stigmarian soils. Footprints, probably 

 of Dendrerpeton, and rain-marks occur in these 

 beds ; and it was in one of them that Mr Marsh 

 discovered the vertebrae of Eosaurus Acadianus) 82 



XXV. 



' Bituminous limestone, 2 feet. 

 Coal, i inch. 



Argillo-arenaceous clay, Stigmaria, 6 inches. 

 Coaly shale, \ inch. 

 Gray argillo-areDaceous shale, ironstone nodules, 



Stigmaria, 1 foot 6 inches. 

 Coaly shale, 1 inch. 

 Gray shale, ironstone nodules, Stigmaria, 2 ft. 6 in. 



Coal, 6 inches 7 2 



Argillo-arenaceous underclay, Stigmaria. 



The bituminous limestone of the roof contains Naiadites 

 carbonarius and N. elongatus, fish-scales, and cyprids. The 

 upper layer of coal contains impressions of Sigillaria and Lepi- 

 dodendron, on some of which are shells of Spirorbis. It has 

 epidermal tissues, vascular bundles of ferns, and reticulated 

 vessels. The coaly shales are of the nature of coarse coals, but 

 with numerous thin layers of shaly matter. The lower coal 

 contains petioles of ferns and Cordaites matted together, and 

 numerous Cardiocarpa. The two thick clay partings and the 

 underclay are Stigmarian soils. 



XXIV. 



(Gray sandstone and chocolate and gray shales, with 



two Stigmarian soils) ..... 147 



XXIII. 



Coal group 6. 



'Carbonaceous shale, passing downward into bitu- 

 minous limestone, 1 foot 10 inches. 



"*' Coal, 4 inches ..22 



Argillo-arenaceous underclay, Stigmaria. 



The roof contains Naiadites carbonarius, Cythere, Spirorbis, 

 fish-scales, and coprolites. The coal is hard and laminated, 

 and has on its surfaces leaves of Cordaites and vascular bundles 

 of fems. It is remarkable for containing scattered remains of 

 a number of species of fishes belonging to the genera Ctenop- 



