346 



Hughes — Geology of the Lake District, 



west, either formed of, or deeply covered by heavy limestone drift, 

 supposed to be the debris of materials eroded from their glens by 

 glacial action. However this may be, the large accumulations which 

 remain in this shape can form but a very small portion of the great 

 sheets of limestone and Coal-measures which once overspread and 

 have been denuded off the face of the country, and of which the 

 mountains themselves are only remnants. 







Fig. 2. — Land-slip at the Protestants' Rocks, on the south side of Glen-car, Sligo. 



The whole aspect of Glen-car forcibly impresses upon an observer 

 the active and powerful agency exerted by atmospheric denudation. 

 It may be plainly seen how the cliffs are gradually receding, yet 

 still preserve their bold character. Naked portions of the mountain 

 tops are covered by small pieces of disintegrating rock ; the preci- 

 pices crumbling away together with rain-washed fragments from 

 above, dress the steep slopes immediately beneath with shingle, the 

 downward motion of which frequently appears to be too rapid for 

 vegetation to cling to ; and these shingly slopes are cut through by 

 the small runnels and more rapid mountain torrents. 



V. — On the Bkeak between the Upper and Lowee Silurian 



EOCKS OE THE LaKE DISTRICT, AS SEEN BETWEEN KiRKBY 



Lonsdale and Malham, near Settle. 



By T. Mc K. Hughes, M.A., F.G.S. 



THE Eocks included under this head are those already described 

 by Professor Phillips, in his paper " On a Group of Slate Eocks 

 in Yorkshire, between the rivers Lune and "Wharfe, etc." (Trans, 

 Geol. Soc, 2nd Series, HI. 1). Also by Professor Sedgwick, in his 

 paper " On the Lower Paleozoic Eocks at the base of the Carboni- 

 ferous Chain, between Eavenstonedale and Eibblesdale" (Quart. 

 Journ, Geol, Soc. VHI. p. 35). 



