ON THE. STOCKDALE SHALES. 697 



continuous witli the morass represented at the right-hand side of 

 our section. Though the depression can be followed to Broughton 

 Mills, no exposure of the Skelgill Beds occurs, and only a few iso- 

 lated patches of the Browgill Beds are seen. 



Before leaving this section at the farm, we would add some further 

 particulars. 



The ashes seen in the extreme left of the section belong to a 

 massive volcanic scries, probably at this point below the whole of 

 the Coniston-Limestone series, though, as is well known, similar 

 beds are elsewhere intercalated between different members of the 

 Coniston Limestone. 



Along the fault between the volcanic rocks and the Skelgill Beds 

 a felsite-dyke has burst, and this has baked the Graptolitic shales to 

 a deep crimson colour. Specimens of this crimson shale can be 

 obtained with the usual fossils of the Dimorpliograptus-zone, viz. : — 

 DlmorpTiograptus conferfus^ Mch., Monograptus reuolutus, Kurck, 

 and 31. teyiuis, Portl. The crimson shales appear to be included in 

 the felsite ; and on the hillside south-east of the stream the normal 

 black Dimorphograptus-^haXes are seen dipping to the south-east, 

 and containing the same fossils as the altered portions. Above .this 

 is a gap with no rock seen, and further up the hill we meet with 

 volcanic rocks like those at the extreme north-west of the section, 

 succeeded on the brow of the hill by normal Coniston Limestone. 

 This dips towards the morass seen in the right-hand portion of the 

 section, and under this either the Skelgill Beds are concealed or the 

 strike-fault which so frequently affects them runs, for on the other 

 side of the morass the ordinary Browgill Beds are found passing 

 into the normal Coniston Plags of the district without any further 

 disturbance. 



It has been observed that no section of any importance in the 

 Stockdale Shales occurs between this point and Broughton Mills. 

 Below the Mills an alluvial tract occupies the position of the Stock- 

 dale Shales ; and although the underlying Coniston-Limestone series 

 is traceable at intervals along this line of strike as far as Millom, no 

 further exposure in the Stockdale Shales is found on the west side 

 of the Duddon estuary, though there is room in some places for the 

 beds of this series between the Coniston Limestone and the Coniston 

 Plags ; but in such cases the rock is concealed by alluvium. 



PoaTca Beck. 



On the east side of the Duddon estuary an anticlinal fold brings 

 up the Stockdale Shales in the neighbourhood of Dalton-in-Furness. 

 In a paper in the ' Quarterly Journal ' for 1878 one of us refers to 

 two specimens of Strichlandinia lirata as coming from the Browgill 

 Beds of Bebecca Hill. The shale in which they occur is certainly 

 like that of the Browgill Beds, but we have never met with any 

 Brachiopods other than extremely minute ones in these beds, and 

 we think it possible that the specimens preserved in the Wood- 



