﻿314 



ME. E. KIDSTON OF THE DIVISIONS OF THE [May I905. 



In 1876, Mr. D. C. Davies pointed out that certain upper beds in 

 Denbighshire, which had been mapped as Permian, should probably 

 be classed as Carboniferous. 1 This area was subsequently visited 

 by Mr. Walcot Gibson, who identified in these supposed ' Permian ' 

 rocks of Denbighshire and Upper Coal-Measures, the three Car- 

 boniferous subdivisions which occur in North Staffordshire, and 

 named by him the Keele Group, the Newcastle-under- 

 Lyme Group, and the Etruria-Marl Group. As equivalent 

 terms for the Denbighshire representatives he has proposed the 

 following : — 



North Staffordshire. Denbighshire. 



Keele Group == Wrexham Eed Sandstones and Marls. 



Newcastle-under-Lyme Group = Coedyrallt Group. 

 Etruria-Marl Group = Eaiabon Marls. 2 



While collecting fossil plants in Denbighshire in 1903, Mr. J. 

 Pringle gave particular attention to the examination of these rocks, 

 but found them very barren of plant- remains. The only species 

 collected were : — 



Species. 



M II 



t/D 5S >>* o> 



« £> S o 



O 5» o 5- 



% II 



^ II 



Pecopzens uniia, Brongn 









Pecopteris Miltoni ( Artis) 







Alethopteris aquilina (Schl.) 





Neuropteris rarinervis, Bunbury 



Calamocladus equisetiformis ( Schl.) 



Lepidodendron lycopodioides, Zeiller (Stbg.) . . . 

 Cordaites principalis (Germar) 



... 





From the Buabon Marls not a single specimen was found. This 

 agrees with the almost-total barrenness of the Etruria Marls of 

 North Staffordshire, from which a single species is recorded. The 

 few species found in these groups in Denbighshire agree with those 

 observed in the corresponding groups in North Staffordshire. ' 



Passing northwards to Cumberland, a series of red and purple 

 shales, occurring in Jockie's Syke, 1 mile east by north of Biddings 

 Junction, were found by Mr. A. Macconochie, in 1879, to contain 

 Upper Coal-Measure plants. This locality was again visited by 



1 Quart. Journ. Geol. Soc. vol. xxxiii (1877) p. 10. 



2 Ibid. vol. lvii (1901) p. 261. 



