THE FOSSIL FLORA OF THE SOUTH WALES COAL FIELD. 



577 



Analysis of Table IV. 



Of the 14 species identified from the New Rock Series, 10 occur in the Upper Coal 

 Measures, of which 3 are characteristic of that horizon. Eleven are found in the Middle 

 Coal Measures, of which 2 are characteristic. Eight are found in the Lower Coal 

 Measures, all of which are, however, found in the Middle Coal Measures. We have 

 here, therefore, only to consider the value of the Middle and Upper Coal Measure species 

 occurring in the Vobster Series. In comparing these with each other it is seen that 

 there is about an equal admixture of Upper and Middle Coal Measure forms found in the 

 Vobster Series, which can therefore only be regarded as a Transition Series connecting 

 the Upper and Middle Coal Measures. 



Again, if the fossil plants of the New Mock Series are compared with those of the 

 Upper and Lower Pennant and White Ash Series of the South Wales Coal Field, it will 

 be observed that of the New Rock Series plants, 6 occur in the Upper Pennant of South 

 Wales, 6 in the Lower Pennant, and 6 in the White Ash Series. Of these, 3 are common 

 to all the divisions, 2 only occur in the Upper Pennant, and 2 only are found in the 

 Lower Pennant, and 3 are only met with in the White Ash Series. The 2 met with in 

 the Upper Pennant are characteristic of the Upper Coal Measures, but the 2 only seen 

 in the Loiver Pennant, and those found likewise in the White Ash Series, are Middle 

 Coal Measure forms : it is therefore tolerably certain that the New Rock Series is the 

 homotaxial equivalent of the Lower Pennant of the South Wales Coal Field, and that 

 both are Transition Series between the Upper and Middle Coal Measures. 



Table V. 



Fossil Plants of the Vobster Series, Somerset Coal Field, — compared with 

 those of the South Wales Coal Field. 



3 » 



U> cs 

 © 

 Q 





CO 



.. a 



o 

 O 





3 ■» 



M'.S 



o & 

 f>«2 





p a 

 o a 



CO 



<j to 



<D ■■= 



4-) f-t 



X 



X 



X 



Calamitina varians, Stbg., sp., 



X 







X 



X 



X 



X 



Catamites (? Suclwivii, Bgt.), 



X 







X 



X 



X 



X 



Galamoeladus equisetiforrnis, Schl., sp., 



X 





X 



X 



X 







Pecopteris oreopteridia, Schl., sp., 



X 











X 



X 



Aletlwpteris deeurrens, Artis, sp., 



X 







X 



X 







Sphenophyllum emarginatum, Bgt., 



X 



X 







X 



X 



1 



X 



Lepidodendron aculeatum, Stbg., . 

 ,, (?) rimosum, Stbg., 



X 

 X 







X 





X 





Sigillaria rugosa, Bgt. ( = Sig. Sillimani, Kidst., not 

 Bgt.), ... 



X 





X 







X 



X 



„ manillaris, Bgt., 



X 





X 



X 



