of the South Wales Coal-field. 



497 



Ft. in. 



Underclay with Stigmaris 5 & 



Argillaceous shale 10 



Coal 1 



Underclay with Stigmariae 5 Q 



Arenaceous shale 7 



Carbonaceous shale 1 



Underclay with Stigmariae 2 



Arenaceous shale 2 6 



Sandstone 90 6 



Arenaceous shale 2 



Sandstone 7 



Clay, and a black carbonaceous-looking 



matter with an uncertain underclay . 2 

 Arenaceous shale with nodules of iron- 

 stone ; the lower part is soft ... 15 



Argillaceous shale 13 6 



Sandstone 27 



Arenaceous shale 19 



Sandstone 44 



Argillaceous shale 2 



Sandstone 50 



Argillaceous shale ; soft towards the bot- 

 tom 28 



Coal, with a small band of carbonaceous 

 shale in it. [This seam is called the 

 Gwscwm, and is extensively worked 



near Pembray.] 3 



Underclay, with Stigmariae in abundance 4 6 



Coal 6 



Underclay with Stigmariae 10 



Sandstone 6 



Argillaceous shale 16 



Arenaceous shale 8 



Sandstone 2 



Arenaceous shale, very hard .... 13 6 



Sandstone 10 



Arenaceous shale 9 



Sandstone 12 6 



Coal, bituminous 9 



Underclay with Stigmariae 10 



Arenaceous shale . 6 6 



Coal, bituminous ; called the Ringog 



Fach seam 12 



Underclay with Stigmariae 2 2 



Argillaceous shale, some parts slightly 



arenaceous 35 



Coal and carbonaceous shale in alternate 

 layers. The coal is bituminous, and 

 the seam called the Ringog Fawr is 

 worked at the extremity of Pembray 



mountain 3 



Underclay with Stigmariae 2 



Coal, bituminous 8 



Underclay with Stigmariae 5 



Ft. in. 



Sandstone 98 



Arenaceous shale 2 



Sandstone 24 



Arenaceous shale 2 



Sandstone 84 



Argillaceous shale. In this are found 



impressions of Ferns in fructification . 8 



Sandstone 20 



Argillaceous shale 16 



Sandstone 66 



Arenaceous shale 4 6 



Sandstone 57 



Coal, without underclay 4 



Sandstone 136 



Coal, bituminous, with a thin band of car- 

 bonaceous shale in it. [This seam is 

 called the Kenrhos, and has been ex- 

 tensively worked.] 4 6 



Underclay filled with Stigmarise ... 5 & 



Arenaceous shale 15 



Argillaceous shale , 8 



Sandstone 3 



Arenaceous shale, with four bands of 



sandstone, each about six inches . . 26 



Sandstone 17 



Coal 6 



Underclay with Stigmariae 2 6 



Argillaceous shale 3 6 



Coal 11 



Underclay with Stigmariae 2 6 



Argillaceous shale 3 



Coal 8 



Underclay with Stigmariae 4 



Arenaceous shale 38 6 



Coal and carbonaceous shale in alternate 



thin layers 6 



Underclay with Stigmariae 4 



Arenaceous shale 13 



Coal, bituminous. Upper Coed Rhial seam 1 6 



Underclay with Stigmariae 4 



Arenaceous shale 17 6 



Argillaceous shale 7 



Coal, bituminous. [This is called the 



Lower Coed Rhial seam.] .... 26 



Underclay with Stigmaris 3 



Argillaceous shale 6 ^ 



Arenaceous shale 25 



Argillaceous shale 3 6 



Arenaceous shale 12 



Coal, bituminous 12 



Underclay with Stigmariae 3 6 



1239 9 



