Appendix to Professor Sedgwick's Paper entitled "An Introduction 

 to the General Structure of the Cumbrian Mountains.'' 



[Read November 6, 1833.] 



In the preceding paper, p. 49 et seq., describing in detail the range of a band 

 of hmestone and calcareous slate separating the upper from the middle division 

 of the schistose rocks of the Cumbrian mountains, I have mentioned two great 

 faults, between Coniston-water Head and Windermere; one throwing the 

 calcareous beds to the south, and the other to the north, of their line of 

 bearing. Both these faults are of enormous magnitude, and the calcareous 

 slate between them, ranging about 40° north of true east, past two or three small 

 mountain tarns, terminates in some broken masses, just where a cross road 

 strikes off from the Ambleside turnpike to Skelwith bridge ; being there cut 

 off by the most northern of the two great faults above mentioned. This part 

 of the range is about a mile and a half in extent; and the calcareous bands, 

 commencing in a low hill north-east of Coniston Hall, exhibit some disloca- 

 tions which, although of comparatively small extent, deserve notice. 



About one third of a mile from their commencement, the calcareous bands 

 are cut through by a fault, throwing them fifty or sixty feet towards the south- 

 east. The line of dislocation is marked by a small watercourse, and by some 

 masses of calcareous slate thrown out of their bearing. The beds then regain 

 their strike (about 15° north of magnetic east), and run to a round hill, due 

 south of the lowest tarn. There they are again cut off, and shifted about 130 

 or 200 yards, to a point south-east of the tarns. Thence they range (nearly 

 with the same strike as before) uninterruptedly for more than half a mile ; 

 increasing, however, gradually in dip as they approach a mountain mass of 

 green slate and porphyry, called Pool Brow. Immediately beyond a mountain 

 road leading to Arnside, there is a third dislocation, throwing the beds about 

 120 paces to the south-east. Beyond this interruption the limestone is again 

 continued, but is soon after (in consequence, I believe, of a number of small 

 dislocations), spread over the brow of a hill {Limestone Hill), and descends to 

 the angle of the Skelwith bridge road, the extreme point being marked by a 

 kiln on the Knipe Fold estate. Here the limestone bands are again cut off, 

 being thrown (as stated in p. 32) more than a mile to the north of their 

 bearing. 



