36 ME. E. A. NEWELL AEBEK ON [Feb. 1909, 



Distribution of the Kent Species in the Pas-de-Calais 



AND N0RD-DE-FrANCE COALFIELDS. 



Pas- 

 Isaine of Species. Z 



A 



le-Ci 

 ones 



B 



ilais 

 1 



C 



K" r d-d e-F r a n c e 



Zones. 1 



A B 



Catamites cf . cisti, Brongn 



Calamophyllites gcepperti (Ett. ) ; . . . 



Annularia- sph'nuphylloidcs (Zenker) 



Annularia stcllata (Schloth.) 



Sphenophyllum cuneifolium (Sternb.) ... ... 



X 



X 

 X 

 X 

 X 

 X 



X 

 X 

 X 



X 



X 



X 



X 

 X 

 X 



X 



X 

 X 

 X 

 X 

 X 

 X 

 X 



X 

 X 



X 

 X 

 X 



X 

 X 

 X 

 X 

 X 

 X 



X X 

 X 



X X 



X 

 X X 



X X 

 X 

 X 



X X 



X 



X X 

 X 



X X 

 X 



X X 

 X 



Neuropteris rarinervis, Bunb 



Neuropteris tenuifolia (Schloth.) 



Neuropteris obliqua (Brongn . ) ... 



Atethopteris lonchitica (Schloth.) 





Pecopteris arborescens ? (Schloth . ) 



Cf. Mariopteris splienopteroides (Lesq.)... 

 Sphenopteris neuroptcroides (Boulay) ... ... 



Eremopteris cf. E. artemisiwjolia (Sternb.) ... 



Cardiocarpus acutus, L. & H 



Lepidodendroii aculeatum, Sternb 



Lepidodendron lycopodioides (Sternb.) 



Lepidopliyllum lanceolat um, L. & H 



Lepidostrobus variabilis, L. & H 



Co7-daif.es principalis (Grermar) 



Cordaicarpus cf. C. corculum (Sternb.)... ... 



i 



rocks at one time covered a wide area in Westphalia, Belgium, the 

 North of France, Southern and Western England and Wales. 2 At 

 the close of Carboniferous times, this sheet was thrown into a 

 series of folds or detached basins, as the result of great earth-move- 

 ments affecting the whole area. These coalfields, though now 

 much denuded, bear a distinct relation to the axis of uplift, which 

 is known as the Mendip-Artois Axis. Godwin-Austen 3 in 1855 

 showed that the above-mentioned Continental coalfields conform to 

 the Artois Axis, and that this axis could be traced into the south- 

 eastern counties of England. His prophecy that Carboniferous rocks 

 would one day be proved beneath the Mesozoic strata in this district 

 has been abundantly justified. Prof. Boyd Dawkins 4 has confirmed 

 the conclusion that the Mendip Axis is a continuation of the ' Axis 

 of Artois,' and has traced it into Pembrokeshire. 



The Westphalian, the Belgian, the Nbrd-de-France and Pas-de- 

 Calais, the Kent, Somerset, Bristol, Forest of Dean, and South- 



1 See Zeiller (94 1 ) and (88). 



2 Godwin- Austen (71). 



3 Id. (56) & (71). 



* Boyd Dawkins (05) p. 32, &c. ; (07) p. 455. 



I 



