ON THE 8T0CKDALE SHALES. 



699 



Having now traced tlie beds along their line of outcrop in the 

 Lake-district, we may proceed to a description of the beds in those 

 outlying districts to which we have previously referred. 



Swindale Beck^ KnocJc, 



If we continue the line of strike of the Stockdale Shales in an 

 east-north-easterly direction from Shap Wells it would pass near the 

 village of Knock, under the Pennine Chain, and close to this village 

 the Stockdale Shales actually do occur in Swindale Beck, and in a 

 tributary which enters it from the north-east. In this tributary 

 (Kundale Beck) some very black shales are seen, evidently separated 

 from the surrounding rocks by a series of faults, and having a strike 

 discordant with that of the adjacent rocks. 



The beds are lithologically like those of tlie Jlmbriatus-zone. and 

 though we have not found the characteristic fossil of that zone, 

 there is no doubt from an examination of the appended list that the 

 beds really do appertain to it. 



Petalograptus ovatus, Barr. 

 Diplograptus sinuatus, Nick. 



Hughesii, Nich. 



Climacograptus normalis, Lapw. 



Monograptus leptotheca, Lapw. 



cyphus, Lapw. 



tenuis, Portl. 



triangulatus, Harkn. ? 



Rastrites peregrin us, Barr. 



In Swindale Beck itself the highest Lower Palaeozoic beds seen 

 belong to the Lower Coniston Flags, and between these and the 

 Coniston-Limestone series is a tolerable section of the Browgill 

 Beds, though the section is by no means complete. The Upper 

 Browgill Beds do not appear prominently, but the two Graptolitic zones 

 of the Lower Browgill Beds are well represented. We could find 

 no representatives of the Skelgill Beds in the main beck, and the 

 lowest Grraptolitic zone which is in the pale shales is only 1 inch 

 thick ; but it has yielded a great number of beautifully preserved 

 specimens of Monograptus turriculatus, Barr., along with Mono- 

 graptus lohiferus, M'Coy, and Rastrites cUstans, Lapw., showing that 

 we have here the turriculatus-zone. This band occurred just above 

 the level of the water, and is now almost entirely worked out, 

 though the stream will doubtless cut a new exposure in time. A 

 few feet above it are a series of black shales interstratified with pale 

 shales and yielding the fossils of the crispus-zone. We have ob- 

 tained from them : — 



Monograptus broughtonensis, 

 Nich. 



panel us, Lapw. 



Cyrtograptus Gray£e, Lapw. 



Cyrtograptus ? spiralis, Gein. 

 Retioliles Geinitzianus, Barr. 

 cf. macilentus, Tornq. 



The Browgill Beds are here traversed by some mica-trap dykes, 

 and the pink staining has affected the Lower Browgill Beds, a cir- 

 cumstance of unusual occurrence. 



