﻿Vol. 64.] CAEBONIFEEOUS LIMESTONE OF THE MIDLAND AKEA. 63 



sequence. The section lies beside a stream, in a field immediately- 

 east of Manor Farm. The exposures are separated by ^aps, but the 

 beds throughout the section maintain a nearly-uniform dip, and 

 there seems to be no doubt as to the undisturbed nature of the 

 sequence. 



The lowest beds of the Pendleside Series consist of hard black 

 limestones, with interbedded black shales containing hard calcareous 

 bands. Fossils, which are fairly common, include Posidonomya 

 Becheri, Posidoniella minoi\ P. Icevis, Aviculojyecten Losseni, Glyphio- 

 ceras striatum, and Nomismoceras rotifonne. No considerable 

 development of passage-beds occurs, for a bed of black crinoidal lime- 

 stone, crammed with brachiopods, is exposed a few yards from the 

 lowest exposure of Pendleside Shales, and below this level no shale 

 is found in the limestone-series. Underlying the black crinoidal 

 limestones is a series of compact, greyish limestones, slightly cherty, 

 and relatively unfossiliferous, but yielding corals typical of the 

 Cyathaxonia-suhzone. 



VI. Local TJNCONFORMrrr between the Carboniferoits 

 Limestone and the Pendleside Series. 



Throughout the Midland area generally, wherever the succession 

 has not been broken by faulting, the absence of a physical break 

 between the Carboniferous Limestone and the Pendleside Shales is 

 clearly evident. Of considerable interest, therefore, is the proof of a 

 local unconformity between the two divisions, furnished by a section 

 in the eastern part of the area.^ 



This section is found in a quarry near Old Mill, beside the 

 Bakewell-and-Winster road, rather more than a mile east of Youl- 

 greave. Fig. 5 (p. 62) is reproduced from a photograph of the 

 section, taken by Mr. H. H. Arnold-Bemrose, who kindly made a 

 special visit to the quarry for the purpose. The black shales of 

 the Pendleside Series, containing Posidoniella Icevis, are here seen 

 to rest with unconformity on the limestones of the Lonsdalia- 

 subzone. The shales, which show no sign of disturbance, rest 

 evenly upon a surface formed by the truncated edges of the 

 limestone-beds. 



This section affords evidence of local earth-movement and erosion, 

 contemporaneous with the deposition, in other parts of the area, of 

 the uppermost beds of the Carboniferous Limestone or the lowest 

 beds of the Pendleside Series. The limestones in the section re- 

 present a high level in the Zowsc?« Z?'a-subzone. The absence of the 

 Cyatha.Tonia-Beds may be due, either to their removal by denudation 

 during early Pendleside-time, or to the locality having formed land 

 during Cyathaxonia-time. 



^ Previous to the commencement of my work in the Midland area, Mr. C. B. 

 Wedd had discovered and investigated a somewhat similar exaoiple of local 

 unconformity at Darlejbridge, a few miles distant from the section here 

 described. His description is not yet published. (But see the Discussion on 

 the present paper, p. 8L) 



