1865.] DAWSON — COAL-FOEMATION. 121 



{Underclay with Stigmaria, ft. in. 



Coaly shale 3 inches 3 

 Ked and greenish underclay, a few rootlets. 



The coaly shale contains many leaves of Oordaites horassi- 

 folia, 



(Red, grey, and dark shale, sandstone, and bitu- 

 minous limestone. Three underclay s and erect 



at oneleyel) .c 67 



IX. 



/Bituminous limestone. 

 1 Coaly shale and coal 3 inches. 

 Coal-group 36... ■{ Reddish shale and ironstone, 2 feet 6 inches. 



I Coa^Sinches 3 



^ Argillaceous underclay, Stigmaria. 



The roof has Stigmaria in situ, and has been a soil or 

 underclay. It also contains Gythere, fish-scales, coprolites, 

 and Spirorhis. In the upper coaly shale are prostrate car- 

 bonized trunks. 



(Reddish and grey shale, sandstone, and bituminous 



limestone) 21 6 



/^Bituminous limestone and shale. 



Coal 4 inches. 



Underclay 1 foot 6 inches. 



Coal 6 inches. 

 Coal-group 37. . . ■{ Underclay 1 foot. 



Bituminous limestone 3 inches. 



Shale 3 inches. 



Coal 1 inch 3 11 



^ Underclay with Stigmaria. 



The roof has Stigmaria, also fish-scales, Naiadites, and 

 Cythere. The shales are pyritized. The coal shows only 

 obscure fragments of plants ; but Sigillarice in the state of 

 ironstone occur in some of the clays. 



VIII. 



(Red and grey sandstone and shale. Two under- 

 clays. Many shells of Pupa vetusta occur in one 

 of these, about 12 feet below the last coal) 83 



VII. 



Calcareo-bituminous shale. 

 Coal 1 inch. 



Coal-group 38... -^ Bituminous limestone 6 inches. 

 Coal 2 inches. 

 Underclay passing into chocolate shale, Stigmaria. 



The bituminous limestone and shale contain Cythere, 

 Naiadites elongatus and iV^. carhonarius, coprohtes, Spirorhis, 

 and Stigmaina. The lower coal has Sigillaria elegans, S. 

 scutellata (?), S. Brownii, AJethopteris lonchitica, Cordaites 

 lorassifoUa, and vascular bundles of ferns. 



(Red and grey shales and sandstones, and one grey 

 limestone with Cythere. One underclay. Many 

 drift trunks, among which are Sigillaria and 

 Lepidoiyh^oios) ,.,.,..,,.,....,.,...... 123 § 



