312 REPORTS OX THE STATE OF SCIENCE. 



in Glaiiiorgaushire, and that the Lower Culm of Devon belongs to the 

 Posidonomya Becheri beds and Prolecanites compressns 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 Lancasliire 

 coallields. At present details appear to demonstrate the value of the 

 lines that have been laid down for the North Staifoi'dshire coalfields by 

 Mr. J. T. Stobbs and myself. 



With regard to the Lower Carboniferous Series, the whole of the south- 

 Avestern area of the Lower Carboniferous series has been zoned by the 

 corals, supported by certain inutations 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 antea) to occur 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 Dibunophyllum beds in that area. 



The uppermost beds of the Lower Carboniferous Series in Staffordshire 

 and Derbyshire are characterised bj' Cyathaxonia, Amplexi-zaphrentiit, 

 Jieaumontia, Michilinia tcnuisepta, and Cladochonus hncillaris. In the 

 upper part of this zone rrolecanites coinpressiis 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 Bolland districts of Yorkshire the same sequence 

 obtains, tl:e lithological structure of the rocks and the rich fossil beds 

 of Cracoe, Settle, and Clitheroe being exactly like those of the Derbyshire 

 area and on the same horizon. They are overlaid by Cyathaxonia beds, 

 and these in turn are succeeded by Posidonomya Becheri beds. 



In Yorkshire, however, the base uf the series is seen in the neighbour- 

 , hood of Ingleljoro'. In the Basement conglomerate area Mr. Cosmo Johns 

 has collected a series of corals, which Dr. A. Vaughan refers to a lovyer 

 horizon than I should have expected to find there. 



Dr. Vaughan thinks the fossiI$ denote the basement beds to be on a 

 horizon at the base of the Lower Seminula beds or Upper Syringothyrjs 

 zones. If this is so, some interesting details must be worked out. 



The whole Carboniferous series under Ingleboro' is estimated to be 

 1,500 feet, and 1,000 feet at least of this is characterised by Giganteid 

 Product! and a fauna which I take to be of Dibunophyllum age. The 

 question to be worked out is to account for the small thickness of the 

 whole of the Seminula beds here, which are about 1,000 feet at Bristol ; ' 

 and in connection with this point it is to be noted that the limestones 

 which rest on the Basement beds west of the Lake District, the Askam 

 and Knipe Scar limestone, contain a definite Dibunophyllum fauna, apd 

 even further north the Lower Limestone Series of Scotland apparently 

 belong to the Lonsdaleia sub-zone. 



j^lthough much has been done — it would seepi that already t)ie joi'oad 



