of the Cumbrian Mountains. 51 



strike the south end of the range of hills on the north-east side of the Duddon ; 

 the hmestone is not, however, found in those hills, but appears, with its usual 

 characters, and the same mean line of dip and strike, in the lowlands on the 

 east side of the ridge. From this I conclude that a break of the strata passes 

 down the valley of the Duddon, accompanied with a lateral movement, not 

 however comparable in extent to the one last noticed. The further range of 

 the limestone is well defined by the following localities, viz. Hartley Ground, 

 Lum Holm, Broughton Mill, and thence up the bed of the river to Stock- 

 beck*. The limestone preserves an undeviating strike and dip ; and in 

 consequence of the sinuosities of the channel, is seen, here and there, above 

 the mill, on different sides of the river. At Stockbeck the river bifurcates, 

 and the limestone runs along the north-west side of the eastern branch, close 

 to Appletreethwaite, where there is a transverse fault, throwing the pro- 

 longation of the limestone, about a hundred yards further to the north. This 

 apparently lateral movement has no effect on the direction of the beds, which 

 preserve an almost perfect parallelism ; but it produces a slight deviation in 

 the direction of the rivulet. 



From Appletreethwaite the limestone continues its course (about 70° or 

 75° east of magnetic north), and making a very slight deflection to the north- 

 east, passes on that side of Ash Gill quarries. Thence ranging over Torver 

 Fell, and across the rivulet, it passes along the line of the Seathwaite road, 

 and reaches one of the flanks of Coniston Old Man ; up which it rises to a 

 considerable elevation, and in a plane nearly parallel to the steep side of the 

 mountain. On reaching the north side of Broadway Beck (one of the streams 

 descending from the mountain), the limestone is again cut off" by a great 

 transverse fault, which appears to throw it to a point about 300 yards south- 

 east of its line of bearing-. 



After reappearing in Scrow pastures, it ranges through a wood, descends 

 down the north side of Mealy Gill, passes close to Old Mill, south of Silverbank, 

 and thence close to the road, and at the foot of a great precipice, to Low 

 Yew Dale, from which place it is prolonged across the low grounds to a point 

 close to Yew Tree. Here it is cut off by the great precipice of Raven Crag, 

 and a vast transverse fault has pushed whole mountain masses of green slate 



* There can be no doubt of the identity of the Millam limestone with that which ranges through 

 the places enumerated in the text. Hence (though the Graystone House limestone, in consequence 

 of the difficulty alluded to in the preceding note, be excluded from the range), we must at least 

 suppose that the Water Blain and Hill limestone bands were once continuous with that of Hartley 

 Ground. But this supposition is quite incompatible with the general strike of the beds, unless, as 

 stated in the preceding note, we interpolate an enormous fault along the line of the Duddon. 



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