Hind : Life Zones in the British Carboniferous Rocks. 335 



be termed the zone of Pferinopecten papyraceus. This fossil 

 appears in the lowest beds, with Posidonomya beeheri, and 

 marks the faunal change. 



I have also shown that the Pendleside Series is represented 

 at Bishopton in Glamorg-anshire, and that the Lower Culm of 

 Devon belongs to the Posidonomya beeheri beds and Prolecanites 

 compressiis beds. 



More work is required to be done in the Millstone Grit 

 Series, and I have in hand certain details which require working" 

 out ; but further research must be done before they can be 

 published. Attention is being" given to the Coal Measure 

 lamellibranchs in the Yorkshire and Lancashire coalfields. At 

 present details appear to demonstrate the value of the lines that 

 have been laid down for the North Staffordshire coalfields by 

 Mr. J. T. Stobbs and myself. 



With regard to the Lower Carboniferous Series, the whole 

 of the south-western area of the Lower Carboniferous Series 

 has been zoned by the corals, supported by certain mutations in 

 the species of brachiopods, by Dr. A. Vaughan and Mr. 

 J. F. Sibly. 



The same zones are, to some extent, and with local 

 differences as to detail, demonstrated {vide anted) to occvir in 

 N. Wales, and most important is the fact that none of the 

 series below the top of the Upper Seminula beds are present 

 there. 



It is more than probable that in the Derbyshire-Staffordshire 

 area the same condition of things prevails, at any rate in the 

 west, but probably the Carboniferous Sea deepened somewhat 

 to the east. At present, however, I have never obtained any 

 fossils which point to a lower horizon than the lower Dibuno- 

 phyllum beds in that area. 



The uppermost beds of the Lower Carboniferous Series in 

 Staffordshire and Derbyshire are characterised by Cyathaxonia, 

 Aniplexi-saphrentis, Beatiniontia, Michilinia tenuisepta, and 

 Cladochoniis bacillaris. In the upper part of this zone Prole- 

 canites compressus occurs. 



Below this horizon are the rich fossil deposits of Park Hill, 

 Castleton, Narrowdale, and Wetton and Thorpe Cloud, which 

 therefore belong to the Upper Dibunophyllum or Lonsdaleia 

 sub-zone, but on the west side of the Pennine uplift Lonsdaleia 

 is itself a very rare fossil. 



In the Craven and BoUand districts of Yorkshire the same 

 sequence obtains. The lithological structure of the rocks and 



1906 September i. 



