Vol. 68.] 



PALiE ONTOLOGY OP THE WAHWICXSHIKE COALFIELD. 



627 



On field evidence the arenaceous strata containing a few thin 

 coals, which occur between the Thick Coal and the Nuneaton Clays,- 

 have been included in the Middle Coal Measures ; while the Nuneaton 

 Clays and the Haunchwood Sandstones, the latter being also an 

 arenaceous series with one or more thin coals, have been placed 

 with the Keele Beds in the Upper Coal Measures. We will now 

 consider the palaeontological evidence for this classification. 



The range in time of the plants from the upper beds of the 

 Productive Measures is recorded in the following table : — 



Distribution op Upper Carboniferous Species which occur in the Upper 

 Beds op the Productive Coal Measures op Warwickshire. 



Species. 



Upper 



Coal 



Measures. 



Transi- 

 tion 

 Series. 



Middle 



Coal 



Measures. 



E q u i s e t a 1 e s. 

 Ccdamites goepperti Ett 



X 

 X 

 X 

 X 



X 

 X 



X 



X 

 X 

 X 

 X 

 X 



X 

 X 



X 



X 

 X 



X 1 



XXXXX X XX X XXX 







Catamites suchowi Brongn 



Calamocladus eqtiisetiformis (Sclilotli.) ... 



S p li e n p li y 1 1 a 1 e s. 

 Sphenophyllum majus ( Bronn) 



P t e V i d s p e r m s and 

 P r i m f i 1 i c e s. 



Netvropteris gigantea Sternb 



Nenropteris heterophijlla Brongn 



Lycopodiales. 

 Slgillaria tessellata Brongn. 



C r d a i t a 1 e s. 

 Coi'daifes horassifolius (Sternb.) 



Cordaites principalis (Germ.) 



Artisia transversa (Artis) 



The absence of typical Upper Coal-Measure species and the 

 abundance of Neuropteris fjigantea are sufficient evidence to prove 

 that the beds immediately above the Thick Coal, including the 

 Four-Feet Sandstone, are Middle Coal Measures. 



We may now conclude that the whole of the lower or pro- 

 ductive division of the Coal Measures of Warwickshire, 

 up to the base of the Nuneaton Clays, is of Middle Coal- 

 Measure age. 



The Upper or Barren Coal-Measures will next be considered. In 

 the following table a list is given of the fossil plants which have 

 been obtained from the Keelc Beds, the Haunchwood Sandstones, 

 and the Nuneaton Clays : — 



2 Y 2 



