﻿Vol. 66.~\ LIMESTONE SOUTH OF THE CEAVEW FAULT. 555 



Swinden Knoll. — On the opposite side of the alluvial flat of 

 Linton rises the important knoll of Swinden, now being worked 

 by Messrs. P. & W. Spencer (to whom, as also to their manager, 

 Mr. Todd, I tender my thanks for permission to visit the quarry at 

 any time, and for help on the spot). There are other cuttings near, 

 notably the railway and road-cuttings near Catchall Inn. 



Swinden Hill is a fine and quite typical knoll, and it is very 

 fortunate that it is thus being dissected. It is an excellent 

 collecting-ground for fossils, and scarcely inferior to Elbolton in 

 that respect. I have collected extensively from both knolls, and I 

 am able to say with some confidence that there is very little 

 difference in their general fauna. At Elbolton it so happens that 

 in making drifts for lead-workings a ' glaber' band was hit upon, 

 and that consequently enormous numbers of that species (Martinia 

 glabra) may be obtained. 



At Swinden it occurs in equally large numbers, and I have also 

 seen vast numbers of other shells. In the summer of 1908 I was 

 shown a deposit of Pugnax acuminata. The shells occurred about 

 3 or 4 feet from the top of the then face of rock, and it was 

 possible simply to scrape out perfect specimens. A quarryman got 

 me a series of handfuls by letting himself down by a rope. I have 

 seen the fossils from this band lying in profusion at the foot of the 

 face of rock. Sometimes there are similar rich finds of Scliizoplwria 

 resupinata, and I have seen them about equally in both Elbolton 

 and Swinden. I have collected a considerable number of corals 

 from both knolls, and they are, again, generally the same. 



The remarks on the lithology of the Elbolton beds will apply 

 equally well to Swinden. Some of the beds are barren of mega- 

 scopic fossils, but consist of finely comminuted calcareous debris 

 mingled with abundant foraminifera. 



The beds are much disturbed. Quite clear folds may be seen, 

 and slickensided surfaces are common. The bedding-surfaces are 

 of the usual very irregular character, so common in these lime- 

 stones ; but there are exceptions, and sometimes the bedding is 

 well-defined and regular. 



The whole appearance of the quarry reminds one of the folding 

 of the well-bedded limestones at Draughton, Hambledon, Eoxley 

 Bank, Skipton Castle, and elsewhere, but of course the folding is 

 more clearly seen in the dark limestone than in the irregularly and 

 coarsely bedded rocks of the Elbolton and Swinden type. 



East and south-east of this big knoll are a few exposures of some 

 significance. In the fixing of the telegraph-posts, between Catchall 

 Inn and the railway-cutting, excavations had to be made in the 

 limestone, and I was able to examine the material. In one of 

 them a fossil band of the usual type was struck, and scores of 

 specimens of Rhynchonellidas might be obtained from the small 

 heap of debris. 



The railway-cutting is very interesting. The same shell and 

 crinoidal debris are interbedded with so-called ' non-fossiliferous ' 

 limestone. The general dip is almost across the cutting, that is, 



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



