ft. 



in. 



1 



6 







2 



1865.] DAWSOK — COAL-FORMATION. 109 



Coal-group 14. . . -j Grey argillo-arenaceous underclay, ironstone, and 



I Stigmaria 



I Coal 2 inches 



\^ Grrey argillaceous underclay, ironstone, and Stigmaria. 



The upper coal has impressions of bark of trees and 

 CordaiUs, especially in its upper part. 



(Grrey and reddish shale and grey sandstone, with Stig- 



marian soils at two levels) 52 



'"Grey shale. 

 Carbonaceous shah 2 inches. 

 Coal-group 15... ■< Argillaceous underclay, ironstone, and Stigmaria... 1 



Coal\ inch '6 



^Argillaceous underclay, ironstone, and Stigmaria.,.. 



The upper shaly bed is a coal interlaminated with shale, 

 which enables the nature of the coaly matter to be ascer- 

 tained. It contains flattened SigiUarim of several species, 

 Calamites, Cordaites, Cyperites, leaves of Sicjillaria, and 

 Lepidopliylla. The clay parting is the roof of the lower coal, 

 and contains Cyperltes and Cordaites. It has been converted 

 into an underclay by the growth of Sigillaria upon it in 

 the formation of the upper bed of coaly shale. The lower 

 coal is compact, but showed an impression of a Calamite. 



(Grey sandstone and grey and reddish shale, ironstone 



nodules) 16 



r Grey argillaceous shale. 



pi IP J Coft^ and carbonaceous shale 2 inches 2 



^ "gi P • • • i Reddish argillaceous underclay, ironstone, and Stig- 

 [^ maria. 



The roof supports an erect tree, a Sigillaria 8 feet high 

 and 1 foot in diameter. It is also rich in Cyperites*, Cor- 

 daites, and Calamites. The coal contains Calamites and 

 and also discigerous tissue of Conifers or Sigillaria. 



(Grey sandstones and reddish and grey shales, with 

 several Stigmarian underclays and coaly films or 

 thin vegetable soils. One of the underclays sup- 

 ports large] stumps of Sigillaria, with Cyjperites, 

 Cordaites, and Le'pidodendron, in the bed around 



their bases) 38 6 



f Red and grey argillaceous shale. 

 Coal 1 inch. 



Gray argillo-arenaceous underclay, Stigmaria, 4 ft. 

 Coal-group 17... -^ Coal 4 inches. 



Carbonaceous shale 4 inches. 



CoalX inch 4 10. 



^ Grey arenaceous underclay, Stigmaria. 



The upper layer of coal consists in part of leaves of Cor- 

 daites. The middle layer has much Cordaites and Cyperites. 



(Underclay and grey shale) 2 i 



C Grey shale, as above. 

 Coal-group 18. .. j Coa^S inches 3 



[ Grey arenaceous underclay, Stigmaria. 



* By this term I continue, for convenience, to designate the leaves of Sigil- 

 laricB. 



