﻿564 MR. A* WILMOftE Otf TitE CARBONIFEROUS [Nov. I9IO, 



like the crinoidal limestone of Downham and Clitheroe, and 

 probably occupy much the same geographical position, that is, near 

 the top of the massif. 



The River Dibb does not show many exposures in its lower part. 

 There is, however, limestone dipping northwards at Dibbles Bridge, 

 but this is north of the fault. 



At Dowscar Nook, near the sharp bend of the river, there is the 

 grit of Eancarl pasture, which forms grit-scars farther east, but 

 is not mapped near the River Dibb. The relationships are much 

 obscured by drift ; but the patch of grit mapped at the upper 

 end of Troller's Gill should apparently be continued westwards to 

 join the patch mapped at Hebden. 



Troller's Gill and Skyreholme. — Here a river has cut 

 right across the anticline, forming a narrow gorge of great beauty. 

 There is an almost continuous section for over half a mile. 



At the southern end of the Gill the Pendleside Beds must be very 

 thin. The grit is not seen in the glen ; but on the hillside, not very 

 far away, is a grit-quarry showing a dip and strike consonant with 

 that of the limestone beds. There is also a well-defined narrow 

 lateral depression, which no doubt coincides with the outcrop of the 

 Pendleside Shales. The refuse of an old lead-mine close at hand 

 probably marks the junction of the Carboniferous Limestone with 

 the overlying beds. As the cutting of the Gill is not very deep, 

 there is no very great thickness of strata exposed. 



Commencing at the southern end, grit overlooks the entrance to 

 the valley. There is limestone in the field not far below the grit. 

 Here it is like the Lower Limestones of Pendle, Salterforth, and 

 Elslack. Crinoidal debris occurs, containing dwarfed forms of 

 crinoids and small shells. 



At the bottom of the glen, at Middle Skyreholme Dam, the 

 dip 18° southwards. Here is well-bedded fine-grained limestone, 

 with very few fossils. I obtained Lithostrotion m i coya7ium, and 

 fragments of the ribbed, fluted form of Productus giganteus. 



A little farther on are small exposures with almost all the knoll 

 fauna, including Productus cora, Pr. giganteus, Martinia glabra. 

 and Pugnaoo acuminata ; many gasteropods and cephalopods ; also 

 Caninia subibicina and species of Lithostrotion. 



The dip now lessens considerably, and, in the narrow part 

 of the gorge, becomes very low. Farther up the Gill the beds 

 have turned over, and the strata are traversed in inverse order. 



I have studied the limestone of the Gill at many points, but have 

 discovered no exception to the fauna of the knoll region of Thorpe 

 and Linton. 



At the top end the shales, the presence of which can only be 

 surmised at the lower end, are well seen just below the upper dam. 

 These shales are the same as those of Swinden Gill, and there 

 are beds with concretions like those of the Pendleside Beds of 

 Pendle, Weets, Salterforth, and Elslack. Clearly, the Pendleside 





