298 PROCEEDINGS OF THE GEOLOGICAIi SOCIETY. [!March. 25, 



portion of a great mass -which at one time was connected with the 

 granite of Wastdale Crag, the removed portion being very likely 

 the agent which converted the green ash-beds into the compact 

 felspar of Harrop Pike. 



The strata which immediately overlie the Coniston limestone are 

 not seen in the neighbourhood of Wastdale Crag, nor in the area to 

 the south of Harrop Pike ; but they make their appearance when 

 the upper portion of Amco-side Eeck is reached. This small 

 stream, which flows nearly along the strike of the strata, exposes 

 the whole of the Coniston limestone, the ash-beds on which this 

 limestone rests, and the rocks wMch succeed it, until the tnie Con- 

 iston flags are reached. The ash-beds, which underlie the Coniston 

 limestone, are here somewhat earthy in their nature ; they are re- 

 gularly laminated ; and between them and the Coniston limestone 

 an ashy breccia is seen, composed of angular fragments of felspar 

 cemented together by a green matrix. This ashy breccia is about 

 two feet thick, and is intersected by felstone dykes, which also tra- 

 verse the ash-beds and the lower portion of the Coniston limestone. 



The Coniston limestone is here thin-bedded, and in its upper 

 portion shaly. It is succeeded comformably by black mudstones 

 which abound in Graptolites. These graptolitiferous mudstones pass 

 up into grey grits, with beds of the latter inters tratifyiug their upper 

 portions. The grey grits contain few or no Graptoi tes, while in the 

 interstratified dark-coloured rocks the same species occur which 

 are seen in the more purely graptolitiferous mudstones. 



The graptoHtiferous mudstones do not extend upwards beyond the 

 lower portion of the grey grits ; and above them occurs a consider- 

 able and continuous thickness of the latter, which seems to be 

 devoid of fossils. The grey grits are succeeded conformably by 

 darker and more flaggy rocks in the form of the Coniston flags ; and 

 as soon as the latter are reached, Graptolites again make their ap- 

 pearance, two species, G.irriodon and G. Sagittarius, being by no 

 means uncommon. 



The strata, as seen in Arnco-side Beck, dip S.S.E. at about 40°. 



Following the Coniston limestone on its line of stiike, we find it 

 exposed in Kentmere, the valley about a mile and a half west of Long 

 Sleddale. Here the limestone has been wrought at Kentmere Hall ; 

 and the Coniston flags are also now extensively quarried a short 

 distance to the south. There are, however, no sections in this 

 valley showing the connexion between the limestone and the flags, 

 the intervals being masked by supei-ficial deposits. The same re- 

 mark also applies to the vale of Troutbeck, where the Coniston flags 

 have been very extensively worked, and where GraptoHtes are 

 abundant along the lines of lamination, where the flags can be split 

 parallel to the planes of bedding. The flags of Applethwaite Common, 

 Troutbeck, are succeeded here by higher strata ajDpertaining to the 

 Coniston-flag series, to which Prof. Sedgwick has given the name 

 " Sheerbate," but only from the circumstance that this upper por- 

 tion of the Coniston-iiag series splits parallel to the lines of bedding. 

 The surfaces of some of these beds in Pennington's quarry aflFord 



