The Correlation of the Yore dale and Pendleside Series. 309 



it is now possible to correlate the Yoredale Series with the 

 Pendleside Series and the culm. 



There is much important palaeontological evidence that 

 Mr. Cosmo Johns totally ignores, to which I will now briefly 

 refer. 



The Redbeds Limestone at the top of the Yoredale Series 

 in Wensleydale contains a very rich fish fauna, collected very 

 carefully by Mr. J. Home, of Leyburn, and described by the 

 late J. W. Davis, of Halifax. This fish fauna, is that which 

 characterises the uppermost beds of the Carboniferous Lime- 

 stone of Lancashire, Derbj^shire, Staffordshire, North Wales, 

 etc., and is always succeeded by the lowest Pendleside fauna, 

 with fish remains of an entirely different facies. 



The fish fauna of the Pendleside Series is wholly different 

 in facies from that of the uppermost Yoredale beds. Dr. 

 Welburn has written on this aspect of the question.* That 

 evidence of the fish fauna, therefore, is diametrically opposed 

 to Mr. Cosmo John's contention, and must be explained away 

 if he wishes to correlate the Yoredale limestones with the 

 Pendleside group. 



Again, with regard to the fauna of the Felltop Limestones. 

 Mr. D. Tait of the Geological Survey of Scotland collected from 

 sixteen localities on this horizon in the neighbourhood of 

 Alnwick, in 1906, and the results of his work were given in my 

 report to the British Association at York.f The fauna col- 

 lected contained fifty forms including corals referred by Dr. 

 Vaughan to — 



Zaphrentis aff enniskilleni. 

 Aidophyllum aff ivinschi 

 Dibunophyllum aff xp. 

 Cyclophyllum aff pachyendothecum. 

 a group which must be considered as indicating a Dibuno- 

 phyllum facies, a view which the rest of the fauna fully sup- 

 ported. 



In face of these criticisms I think Mr. Cosmo Johns has still 

 to prove that the Yoredale Series contain any indication of a 

 Pendleside fauna. 



The view that Mr. Johns now puts forward is very old, and 



* ' Proc. York. Geol. Soc, 1902 ', Vol. XIV., p. 465. Ibid. 190s, Vol. 

 XV., p. 380. 



t Vide Report, p. 308 et seq. 



1910 Aug. 1. 



