130 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [DeC. 17 



The appearance of the Skiddaw slates in this locality must be 

 referred to the same cause to which those of Rossgill and Eggbeck 

 have been assigned, namely, the occurrence of another anticlinal 

 parallel to those already mentioned. 



In following up the Lowther from the junction of Thornship-bcck, 

 we have at intervals many exposures of the imperfectly bedded, 

 greenish-grey rocks. These are well seen at Cragg Mill on the 

 north side of Shap Moor, and among the rocks here are found the 

 masses which have the imbedded angular fragments already men- 

 tioned as occurring at Bampton and elsewhere. Like the same rocks 

 at Bampton, it is probable that they mark the position of a syncli- 

 nal, the rocks on their N.^.W. side having a S.S.E. dip, while in 

 Wet Sleddale, on the south side of the Lowther, an opposite dip 

 obtains. In the streams flowing from Wastdale Pike and Harrup 

 Pike, which are tributaries to the Lowther from the south side of Wet 

 Sleddale, the prevailing dips are also N.jN\W. 



On the high road leading from Shap to Kendal, owing to the moory 

 nature of the ground, the greenish-grey rocks are not well seen in 

 the interval between Shap Common and Wastdale Crag. 



In this interval we have, however, at Blea-beck, a mass of basalt 

 crossing the road, and extending north-eastwards to the Lancaster 

 and Carlisle Railway, where, at the summit- cutting, this basalt and 

 its relations to the Silurian and Carboniferous rocks can be distinctly 

 made out (fig. 5). 



Fig. 5. — Section at the Summit-cutting on the Lancaster and 

 Carlisle Railway. 



s. 



N. 

 Carboniferous beds 



-C^S 



Conglomerate. 



mH^/A i 





Lower Silurian shales. 



Basaltic trap-rocks. 



The principal mass of this cutting is the basaltic trap, which on 

 its north side has greenish Silurian shales dipping X.N.W. at a high 

 angle (above 50°). Upon them, and also upon a portion of the trap, 

 conglomerates occur, made up of fragments of Silurian shales, quartz, 

 chert, and trap, and dipping N.E. 10°. The conglomerates have 

 purple grits above them, the total thickness of both being about 

 20 feet ; and an irregular, nodular limestone, averaging a foot in 

 thickness, lies upon the latter. On this irregular limestone, 8 feet of 

 purple shales with limestone-nodules are seen, being succeeded by 

 grey shales about 5 feet thick, having upon them another nodular 

 limestone 18 inches in thickness, above which is a white grit, sup- 

 porting the hard limestone which is wrought on Shap Moor. 



The junction between the greenish-grey rocks and the porphyritic 

 syenite of Wastdale Crag is nowhere very apparent. There is seen, 



