﻿544 ME. A. WILMOKE ON THE CARBONIFEROUS [Nov. I9IO, 



There is no great thickness exposed, as the stream runs along the 

 strike for the most part. Fossils , are not numerous. I have 

 obtained Rhipidomella michelini (L'Eveille), Strophomena analoga 

 (Phill.), Posidonomya becheri, Orthoceras sp., and a single coral, 

 probably Zaphrentis omaliusi, M.-E. & H. 



A quarry near the Gisburn-Hellifield Eoad shows the same 

 massive limestone as at^winden Gill Head, with a slightly higher 

 dip. Hence there is little doubt about the general sequence. 



Bell Busk Cutting. — There are two quarries close to the 

 railway, immediately north-west of Bell Busk Station. In the 

 eastern quarry are massive dark-grey limestones, almost black 

 in places, with very little shale. The bedding is very definite, 

 with some slightly hummocky surfaces. The dip is almost due north, 

 at an angle of 10° to 12°. Syringopora cf. reticulata is exceedingly 

 •common. A small reticulata form, with very little tendency to 

 irregular ramulose branching, occurs in masses ranging up to a foot 

 in maximum diameter. The corallum starts from a somewhat 

 elliptical or circular base, and grows into a sub-ovoid mass. It is 

 noteworthy that some of the masses have the small end upwards 

 and some are lying sideways. Did the masses float into the cal- 

 careous mud in which they now occur ? 



A ramulose Syringopo7*a with wide tubes, somewhat like S. 

 gigantea, Thomson, is apparently rare. Michelinia sp., with thin 

 walls and with corallites 3 to 4 millimetres wide, occurs ; but 

 I have not succeeded in obtaining anything like a complete 

 corallum. It appears, however, to agree with the description of 

 Michelinia tenuisepta (Phillips), as given by Dr. Vaughan in the 

 Loughshinny paper. 1 (It is noteworthy that his form is common 



Near the top of this exposure Caninia aff. gigantea, Mich., is 

 occasionally found, but it seems to be very rare. Brachiopods are 

 scarce and fragmentary, Orihotetes crenistria and Productus semi- 

 reticulatus being the only good specimens that I obtained. 



Across the railway is the second exposure. Here the beds have 

 approximately the same dip and are higher in the sequence. 

 Shale beds are more abundant towards the top of the cutting. 

 There is some disturbance shown, slickensided surfaces being 

 plentiful and some rolling being seen. The fossils are : — 



Orthotetes crenistria (Phil].). (Frag- 



mentary.) 

 Athyris aff. royssii (L'Eveille). 



Caninianff. gigantea,M\ch. (Common.) 

 Zaphrentis sp. (Only one specimen.) 

 Syringopora cf. reticulata (Goldf.). 



(Not so common as in the other 



quarry.) 



Note. — Caninia gigantea, specimens often crushed, as at Swinden Grill 

 Head, at Hetton, and elsewhere. 



The sequence of these beds is interesting when compared with 

 those of other exposures, such as Warrel and Swinden Gill, already 

 described, and Crag Laithe, Winterburn, and Hettou, to be 

 described. 



1 Quart, Journ. Geol. Soc. vol. lxiv (1908) pp. 455-56. 



