468 CARBONIFEROUS ROCKS IN CUMB. CO.— LOGAN & FLETCHER 



Ft. In- 



Underclay or understone, being beds of various 

 materials, immediately subjacent to tbe 

 seams of coal and carbonaceous sbale and 

 bituminous limestone, and invariably pene- 

 trated by the recumbent branches or radiat- 

 ing leaves of the stigmarise ficoides. Every 

 one of the seams of coal and carbonaceous 

 shale rests upon a stigmaria bed, with the 

 exception of one instance, where 4 feet of 

 gray argillaceous shale, destitute of the 

 plant, is interposed between the stigmarise 

 bed and the coal, and one instance where the 

 stigmarise are doubtful. There are twelve 

 instances of stigmarise beds without super- 

 incumbent coal. The material constituting 

 the stigmarise beds is as follows : • 



Ganister, a hard silicious stone 4 • 6 



Sandstone — 



Gray and cnimbly, sometimes a doubtful 



fireclay • . T2 10 



Greenish gray 4 



76 10 



Arenaceous shale, fit for fire clay — - 



Gray 189 



Greenish gray 25 6 



Eed 6 



220 6 



Argillaceous shale, sometimes fit for 

 fireclay — 



Gray OO 4 



Greenish gray 2S 



Green 12 10 



Ked and green 15 



Red IT 3 



202 5 



501 3 



