1865.] DAWSON COAL-FOKMATION. 115 



aporous bast tissue ; it also contains Cyperites and many ft. in. 

 vascular bundles of ferns. 



(Grey sandstones and argillaceous shale. Erect trees 



attwolevels) 37 



{Grey shale. 

 Coal and coaly shale 1 foot 1 

 Argillaceous underclay, ironstone, and Stigmaria. 



The roof contains erect Sigillaria and Calamites, also Cor- 

 daites with Bpirorhis attached, and Lepidodendron. The 

 coal has in one layer much Cordaites, in others it includes 

 an immense number of specimens of Sporangites papillata ; it 

 has also bast tissue, epidermal tissue, and discigerous tissue. 



(Shale and sandstone, penetrated by Stigmarian root- 

 lets, and containing in one of the shales Lejpido- 

 dendron, Sigillaria, and Car^olithes) 13 



(Grey shale. 

 Cba/ and coaly shale 6 

 Argillaceous underclay, Stigmaria. 



The roof has much Cordaites. The shaly portions of the 

 coal contain Sigillaria elegans, Alethopferis lonchitica, Cor- 

 daites horassifolia, Lepidodendron, Diplotegium, Trigono- 

 carpum, Stigmaria, and Sporangites glabra, also vascular 

 bundles of ferns and bast tissue. 



XVIII. 



(Grey and red shales and grey sandstone ; one of the 

 latter with erect Calamites and Sigillarm. One 

 underclay) , 69 4 



XVII. 



{Grey shale. 

 (7o«^8 inches 8 

 Argillaceous underclay, Stigmaria. 



The roof has Cordaites and many decayed stipes. The 

 coal has Cordaites and vegetable fragments. 



(A very thick sandstone with shales. Erect Cala- 



footprints of reptiles, and rain-marks) 57 



XV. 



^ Grey shales with ironstone. 

 Coal 3 inches. 

 Coaly shale 2 inches. 

 Coal 3 inches. 



Underclay, Stigmaria, 6 feet. 

 Coal-group 14. . . ■{ Coaly shale 4 inches. 



Underclay, Stigmaria, 1 foot. 

 Coaly shale 8 inches. 



Coal 2 inches 8 10 



Argillo-arenaceous underclay, Stigmaria, and iron- 

 ic stone. 



On the roof of the upper coal is a fine-ribbed Sigillaria 

 with Stigmarian roots. In the roof and shaly partings 



