526 Correspondence — I)r. Wheellon Hind. 



this zone at this spot is quite a surprise, for, standing at Russell Hill 

 one turns to the left, where at the Haling Pit the bottom beds of the 

 M. coranguinum beds are exposed ; while immediately facing us^ 

 at the Purley Junction pits (now ceased to be worked) we have the 

 M. cortestiidinarmm zone ; the dip, as revealed by tlie successive 

 zones to the Chalk escarpment, being to the north and disappearing 

 under the Tertiaries at South Croydon. 



One can only account for this zone by a fold in the Chalk, as we 

 have at Beddingtou, a little further south-west, the upper part of the 

 M. coranguinum beds exposed which are at a lower level, according 

 to ordnance datum, than Russell Hill. 



Subsequent discoveries will be watched with interest by all 

 workers in Chalk geology. G. E. Dibley, 



7, Champion Crescent, Lower Sydenham, S.E. 

 Auffust 29th, 1904. 



EQUIVALENTS OF THE LOWER CULM. 

 Sir, — Mr. Jukes-Browne has pointed out to me that in my paper 

 on the Homotaxial Equivalents of the Lower Culm I have left it 

 uncertain what remains in North Devon as the representative of 

 the Lower Carboniferous series, and that I might be understood to 

 mean that there is absolutely no representative of the Carboniferous 

 Limestone in that area. He also reminds me that Salter in 1863 

 mentioned the existence of soft fossiliferous shales containing Car- 

 boniferous fossils above the Pilton Beds to the north of Barnstaple, 

 which I noted as passage beds (p. 397). He further suggests that 

 my table of comparative succession (p. 401) might be amplified thus : — 

 Devonshire. South-West Ireland. 



Lower Culm ... ... ... Fosidonom //a heda. 



Fremingtou Beds Carboniferous shales \ 



Soft shales | Carboniferous slate ) 



Pilton Beds ( Carboniferous, lower part | Upper 



Baggy Beds Coomliola Beds j Devonian. 



I am quite prepared to admit the possibility that the Lower 

 Carboniferous series is represented in North Devon and in South- 

 West Ireland, but at present I am not sufficiently conversant with 

 the paleontology of the Pilton Beds to discuss the question. For its- 

 settlement, moreover, some further field-work would be required. 



Wheelton Hind. 

 Stoke-on-Trent. 



September Ufh, 1904. 



3VnXSOEIL,L.A.IsrEOTJS . 



Eoliths : a Chance for Collectors ! — We have learnt from 

 Mr. Benjamin Harrison, of Jghtham, that, with the kind permission 

 of Sir Mark Collett, the present owner of the property, he has 

 recently opened a fine section in the Eolithic Drift on Terrys Lodge 

 crest. Mr. Harrison hopes that anyone desirous of studying thi& 

 drift for themselves will take advantage of this opportunity. 



