865.] DAWSON COAL-POEMATION. 117 



coal is hard and coarse, and contains flattened broad-ribbed ft. in. 

 Sigillarla, Cordaiies, and vascular bundles of ferns. 



(Shale and sandstone, erect trees at one level) 31 3 



XIII. 



(G-rey shale. 

 Coal 8 inches 8 

 Argillo-arenaceous underclay. 



The roof has an erect Sigillaria. The coal is shaly and 

 laminated. It contains much Cordaites, also Lepidodendron, 

 Ccdamites, and Alethopteris loncJiitica. In one layer there 

 are Naiadites, SjpirorUs, and scales of fishes. 



(Grey sandstone and shale in several beds, 8tig- 



maria) 29 



r Argillaceous shale. 



Coal-ffrouD 19 J ^^^^^ shale 4 feet, 



° P • • • 1 Bituminous limestone 2 feet 6 inches. 



LCoal 1 inch 6 7 



The roof has Naiadites, scales and teeth of fishes, Cythere, 

 and Spirorhis. The coal is hard and coarse, with vascular 

 bundles of ferns and prostrate Sigillarice. 



(Shale and sandstone) 20 6 



{Coaly shale 1 foot. 

 Bituminous limestone 1 foot 6 inches. 

 Coal and clay partings 2 feet 4 inches 4 10 



The roof has Naiadites, JSpirorbis attached to plants, and 

 small rhombic fish-scales. The coal alternates with lime- 

 stone at the top, and contains remains of Sigillaria, JSporan- 

 gites, and vascular bundles of ferns. 



(Sandstone, and grey and black shale with coaly 



layers) 21 



(Grey shale and calcareo-bituminous shale. 

 Co«nO inches 10 

 Argillaceous underclay, Stigmaria. 



The roof has obscure vegetable fragments and Naiadites. 

 The coal contains vascular bundles of ferns, bast tissue, 

 uniporous cells, and scalariform and reticulated vessels. 



(Grey sandstone and shale. Two underclays) 20 



r G-rey shale. 



Coal-group 22. .. -^ Coal and coaly shale 2 inches 2 



[ Argillaceous underclay, Stigmaria. 



This bed was not well exposed. 



(Sandstone and shale, with one erect tree and two 



underclays) 12 



/ Coaly and grey shale. 

 Coal and coaly shale 4 inches. 

 Coal-group 23... \ Bituminous limestone 4 inches. 



I Coa^ and coaly shale 7 inches 1 3 



1^ Argillo-arenaceous u.nderclay, Stigmaria. 



The roof has an erect tree, also Cordaites and Spirorhis. 

 The shale and bituminous limestone contain Sigillaria and 



VOL. XXII. PART I. K 



