On the Fossil Fishes of the Carboniferous Limestone Series of Great Britcn. 543 
Buxton, Matlock and Castletown. Above the limestone there is a series of shales 
and gritstones, about 500 feet in thickness, which are the equivalents of the 
Yoredale series of Wensleydale. It is principally from the black shales im- 
mediately overlying the thick Mountain Limestone, that the remains of fishes are 
obtained in this district. In no instance are they plentiful. 
In Yorkshire the Mountain or Carboniferous Limestone is very largely developed, 
attaining its greatest thickness in the district around Clitheroe. It is there 
extensively quarried, and the remains of mollusca, bryozoa, and encrinites are 
abundant but fish remains have not been found ; at Skipton one or two examples 
of the teeth of Lophodus have been discovered, and at Settle, where the limestone 
is exposed along the line of the Craven fault, and quarried, the teeth of several 
species of fishes have been discovered. The principal locality in Yorkshire, 
however, is near Leyburn, in Wensleydale, in the uppermost beds of the formation. 
It has already been observed that the thick-bedded, massive limestone of the 
districts named above, as they extend northwards, become divided by the inter- 
lamination of wedge-shaped beds of shale and sandstone into several thinner beds, 
forming a somewhat complex series to which the late Prof. Phillips applied the 
term ‘‘ Yoredale Series.” The following section gives approximately the series as 
it occurs in Wensleydale :— 
Millstone Grit Series, : ; ; : ; 5 ; — feet. 
Red Limestone, : : : F . : 20 to 40 feet. 
Shale, . 0 6 ‘ ‘ ; i ; : : — 
Main Limestone, ; ; ‘ ? 60 feet. 
Grits, Coal and Shale, . : ; F . ; ; : 80 ,, 
Underset Limestone, é c 6 c 6 : : ‘ 30 ,, 
Laminated Grits, flagstones and shale, with band of impure productal limestone, BO) oy 
Middle Limestone, BY) 5 
Gritstones and flags, IO 
Simonside Limestone, ; 20 NF 
Flags, Shales and Grits, . : 0 6 ; ; ; wr LOO. 
Hardrow Limestone, 40 ,, 
Grits, Shales and Ironstone, p 6 6 . 0 . 5 100 . 
Lower massive or Scar Limestone (exposed), : . : . 0 | ABD gg 
The uppermost limestone, locally named “ Red Beds,” is the one from which a 
very large majority of the fossil fish remains have been obtained, which are known 
to occur in the Yorkshire beds. A few have been found in the main limestone of 
the same district. 
In Northumberland the Carboniferous Limestone formation becomes still more 
‘divided into alternations of limestone, sandstone and shales than in the north of 
Yorkshire. It lies, without the intervention of the Old Red Sandstone series, on 
the contorted and denuded edges of the Silurian rocks. The strata of Carboniferous 
age, beneath the millstone grits have been divided into two groups; the lower, 
TRANS, ROY, DUB, SOC., N.S., VOL. 4Nn 
