694 MH. J. E. MARE AND DE. H. A. NICHOLSON- 



calcareous nodular band forming the base of the Upper Browgill 

 Beds is seen, the intervening ground being covered with drift. A 

 few feet above the calcareous band and on the other side of the 

 bridge are some light shaly beds, stained pink, with a thin pebbly 

 seam a quarter of an inch thick, about 7 inches from the summit. 

 The pebbles are only about the size of a pea and are well rounded ; 

 and we mention this band as it is the only one which we have 

 found in the whole St ockdale- Shale series which has any coarse 

 material in it. Above this is a considerable thickness of pale shale 

 with hard grits belonging to the Upper Browgill Beds ; but the 

 junction with the Lower Coniston Flags is not seen. 



The depression caused by the Skelgill Beds or by the strike-fault 

 runs in a south-westerly direction from this over a low col to the 

 head of Appletreeworth Beck, which is reached in about one sixth 

 of a mile from Ashgill. 



Appletreeworth Beck, 



Sections in the Stockdale Shales are exhibited at intervals for 

 over a mile between the head of the beck and Appletreeworth 

 Parm. The stream runs in a south-westerly direction and along 

 the strike of the beds, and we find the Lower Skelgill Beds as usual 

 continuous with the Ashgill Shales and occurring generally on the 

 north-west (right) bank of the stream, whilst the middle and upper 

 beds and the Browgill group are developed on the left bank. No 

 section of any importance need detain us until we reach a precipi- 

 tous cliff a few hundred yards above the farm on the left bank of 

 the stream. The section across the stream at this point is shown 

 in fig. 9. The dip-slope is composed of the usual Ashgill Shales, at 

 the summit of which is a band of large calcareous nodules, as at 

 Skelgill. Immediately above this is a very thin, dark grey, calca- 

 reous band crowded with Ostracods and inseparable both from the 

 Ashgill Shales below and the Atrypa-flexuosa beds above. We do 

 not know whether to refer this Ostracod-bearing band to the lower 

 or upper group ; but it is a matter of no importance, as there is not 

 the slightest doubt that a passage exists here. The Atrypa-flexuosa 

 band is only 3 inches thick and consists of the usual light grey, 

 mottled, pyritous limestone. The usual strike-fault runs down the 

 stream ; but at the upper end of the cliff it occurs some way off the 

 stream on the left bank, and allows of the occurrence of about 15 

 feet of Bimorj^hograptus-shales with Monograptus revolutus, &c., 

 in a small cliff. These beds are probably folded on themselves, as 

 they exhibit a simulated false- bedded structure. At the point 

 where our section is taken, lower down the stream, the fault has 

 come to the bed of the stream, and below the line of section the 

 thickness of beds rendered invisible by the fault increases, and 

 higher and higher beds are brought against the Lower Skelgill Beds, 

 until at last all the zones of the Middle and Upper Skelgill Beds are 

 faulted out and the Browgill Beds rest against the Lower Skelgill 

 Beds. 



