5GG 



MR ROBERT KIDSTON ON 



the specimens from the South Wales Coal Field in the Jermyn Street Museum, and to 

 figure the specimens of Lepidodendron longifolium shown on the Plate which accompanies 

 this communication. 



Owing to the extent of faulting and other causes, it has hitherto been found impos- 

 sible to correlate with certainty many of the seams worked at different parts of the Coal 

 Field ; hence it is very difficult to construct a general Section, showing the relative 

 position of the seams to each other. 



The following four Sections, which have kindly been prepared for me by Mr W. 

 O'Connor, will, however, show the position of the Coal Seams from which the fossil 

 plants have mostly been derived. 



1. Section of Strata in the extreme Western Portion of the Coalfield. 



(Pembrokeshire. ) 





Feet. 



Ft. in. 



Bright Vein, ..... 





3 



Strata, 









80 





Rock Vein, 











4 



Strata, 









50 





Low Level or Small Vein, 











1 8 



Strata, 









130 





Timber Vein, 









. > ■ 



7 



Strata, 









24 





Little Vein, 











1 6 



Strata, 









36 





Lower Vein, 











1 10 



Note. — The position of these seams in the series is undetermined. 



II. Section of Seams at Llanelly. Upper Pennant Series. 

 (Upper Coal Measures.) 





Feet. 



Ft. in. 



Strata, . ... 



280 





Rosv Vein, 















2 



Strata, 













56 



• * • 



Fiery Vein, 













• ■ • 



2 9 



Strata, 













111 





Golden Vein, 















1 10 



Strata, 













115 





Bushy Vein, 













... 



1 10 



