OF THE CARBONIFEROUS SERIES, 635 



the same strata have yielded similar forms elsewhere. With such 

 good evidence before us we can have little hesitation in placing the 

 " Slaty-band " beds on the horizon of Stage E. 



As regards Stage C, perhaps the evidence is not so conclusive as 

 in the former case. Nevertheless there are strong grounds for the 

 course I have adopted. It will be recollected that as we proceed 

 northwards from the borders of Lancashire a marine band of lime- 

 stone makes its appearance, which ultimately assumes important 

 proportions. In the Clitheroe and Pendle district the Yoredale 

 series is of extraordinary thickness (from 3500 to 4000 feet) ; and it 

 is really almost incredible that such a mass of strata should be un- 

 represented in Scotland, which is not (after all) so many miles distant. 

 On the other hand, the Carboniferous Limestone of Derbyshire itself 

 is represented in the North of England only by the " Scaur-limestone" 

 series of Prof. Phillips, as Mr. Lebour has very clearly shown *. On 

 reading Mr. Lebour's paper, it occurred to me that the explanation 

 of the Scottish series was to be found in an arrangement such as 

 that given below ; and in consulting with my colleague, Prof. Geikie, 

 and Mr. Lebour, I am glad to find that they regard my suggestion 

 as not improbable, either on stratigraphical or pakeontological 

 grounds ?• If we place the Scottish and the North-of-England series 

 side by side we obtain the following results :— 



Supposed Representative Stages. 



North of England. Central Scotland. 



Stages E. Gannister beds. (E.) Slaty-black-band series. 



„ D. Millstone Grit. (D.) Moorstone-rock series. 



q f " Great limestone." (C) ( Upper Limestone series. 



' \ Flagstones and shales. ^ '' \ Lower Coal-and-Ironstone series. 

 B. " Scaur-Limestone series." (B.) Lower Limestone series. 



A. (Sometimes absent.) (A.) Calciferous Sandstone series. 

 (" Tuedian.") 



In corroboration of this view of the arrangement, Mr. Lebour 

 states that " on comparing a list of 130 species of fossils from the 

 ' Great Limestone' (the most marked Yoredale bed) with Scotch 

 lists J, I find that 32 species are not known in Scotland, that about 

 60 run through the three Scotch divisions, that 28 are found in the 

 Scotch upper and middle series only, and 10 are only found in the 

 lower series." Now, making allowance for the difference in geo- 

 graphical position, and recollecting that during the earlier Carboni- 

 ferous periods the Scotch and English marine areas were to some 

 extent separated by the barrier of Silurian land, it must be admitted 



* " On the Larger Divisions of the Carboniferous System in Northumber- 

 land," Proc. North-of-England Institute of Mining Engineers, vol. xxv. 



t Letter dated 17th Nov. 1876. — Mr. Lebour has adopted the name " Ber- 

 nician beds " to include Stages B and C in Northumberland. 



| As the excellent " Catalogue of the Western -Scottish Fossils," by Messrs. 

 Armstrong, Young, and Bobertson (Glasgow, 1876). 



