﻿Vol. 66. ,] CARBONIFEROUS LIMESTONE SOUTH OF CRAVEN FAULT. 539 



23. On the Carboniferous Limestone South of the Craven Fault 

 (Grassington-Hellifield District). 1 By Albert Wilmore, 

 B.Sc, F.G.S. (Read April 27th, 1910.) 



[Plates XXX VIII-XLI— Corals.] 



Contents. 



Page 



I. Introduction 539 



II. Description of the Chief Exposures 541 



III. Notes on some of the Corals 566 



IY. Irregular Distribution of some of the Corals . 574 



V. Notes on the Grenus Syriiigopora 576 



I. Introduction. 



South of the great Craven Fault is a district which may well be 

 termed the Craven Lowlands. It lies between the limestone 

 scars of Settle, Malham, and Grassington on the north and the 

 grit hills of the Pendle Range on the south. The district thus 

 defined may be held to include all that part of Craven which 

 extends from Clitheroe to Skyreholme, and from the so-called 

 ' middle branch ' of the great fault-system, to the grit hills of 

 Simon's Seat, Burnsall Fell, Flasby Fell, Carleton Moor, and west- 

 wards to Pendle. 



The Carboniferous Limestone and Pendleside Beds, which occupy 

 almost the whole of the district under consideration, are everywhere 

 very much folded and faulted. 



The greater part of the region is much obscured by drift. With 

 the exception of a good section at Troller's Gill (which does not, 

 however, show any considerable thickness of beds) there are no 

 long continuous sections, and the geologist must remain perforce 

 content with the numerous isolated exposures which are scattered 

 over the whole district. Owing to the continually changing dips, 

 it is not easy to make out the sequence of the beds. 



This paper will be confined to a description of the Carboniferous 

 Limestone, as it may be seen in the various exposures between 

 Swinden Moor on the west and Skyreholme on the east. I have 

 previously discussed other parts of the Craven Lowlands. 2 



The lithoiogical character of the limestone varies considerably in 

 different parts of the district, the most widely different types being 

 the greyish- white, irregularly-bedded shelly limestone of Elbolton 



1 Thesis approved for the Degree of Doctor of Science in the University of 

 London. 



2 Proc. Yorks. Geol. Soc. n. s. vol. xvi (1906-08) pt. i, pp. 27-44 ; ibid. pt. ii, 

 pp. 158-70 ; aod ibid. pt. iii, pp. 347-71. 



Q. J. G. S. No. 264. 2 p 



