334 Hind : iJfc Zones in the BrilisJi Ciirbonijcrous Rocks. 



The result of Mr. Tail's collecling' last year in Northumber- 

 laiid is expressed in a table which is printed in the report. 



The object of his research was to endeavour to ascertain the 

 fauna which characterises the horizon of the Fell Top Limestone, 

 which may be reg'arded as the top of the Carboniferous Lime- 

 stone Series in that area. The thin limestone is succeeded by the 

 Millstone grits of that district. 



The general results show that the fauna has a Dibunoph}llum 

 facies, but that he did not get any of the corals which in the 

 Midlands we now recognise as zone indices of the top beds — • 

 Cyathaxonia and Amplexi-zaphrentis. 



The Great Limestone of Durham and Northumberland 

 contains many specimens of Dibiiiiop/iy/Inin and Lonsdaleia 

 fioriforniis, and we therefore correlate it with the Upper 

 Dibunophyllum zone of Bristol. The beds collected from are 

 some 400 feet higher in the series. Westgarth Foster esti- 

 mates the Great Limestone to be 408 feet below the Fell Top 

 Limestone. 



It may serve a useful purpose to summarise the results 

 arrived at since the Committee commenced work some years ago. 



At first, work was chiefly done on the series of black shales 

 and limestone, to which Mr. J. A. Howe and I gave the name 

 of Pendleside Series. Year by year collecting in various 

 districts has demonstrated our thesis that these beds had a 

 definite fauna which distinguished them from the Voredale 

 Series of Wensleydale. We had obtained this fauna between 

 two very different degrees of latitude in the Midlands ; that is, 

 the fauna has never been obtained north of the latitude of Settle, 

 or south of the latitude of Leicester. The fauna is found to 

 characterise beds which succeed the upper Dibunophyllum 

 zones of the Carboniferous Limestone as far west as Co. Clare 

 and Co. Limerick, Loughshinny, Co. Dublin, the Isle of Man ; 

 it also occurs E. at Vis6, Clavier near Dinant, and near Mons, 

 in Belgium. 



Zones can be distinguished in the series according to the 



following table : — 



„ c /-^ , • 7- I • ( LowiM- Coal Measures. 



Zone ot Gastnoccras listen ■•• I m-h . ■. 



I^IVIi list one i^nt. 



Zone of Glyphioceras hilinirue ... 



Zone of Gh'phioccras shlrixlc ...\ i^\ i- j- 1 



,, c .-; ',, . J- 1 J Cilvphioceras diadema. 



Zone ot Glvp/iiorcras n'tirulatutii \ ■ ' 



Cylliaxonia f Zone of Posidononiyn beclivri ... Noinismoceras rotifornie. 



beds \7.onc oi Proh'canih's roniprcssiis... I).,. 



The whole of the Upper Carboniferous Series, comprising 

 the Pendleton Series, Millstone Grit, and Coal Measmes, might 



Naturalist, 



