230 



If such be the origin of these angular Gravels, it furnishes a 

 conclusive argument in favour of snb-«=rial denudation; because 

 n considef that the deposits are found in aU the vaUeys at 

 various heights, ranging, a. I have stated, iiom 200 to 700^^ 

 it ismanifelt that simUa. conditions prevaUed during the whole 

 period of their formation, and no such deposits could have taken 

 place in vaUeys washed by tides. 



^ Upon the whole, I think there is Uttle or no evidence o 

 marLe action in the valleys, while their P'--* «™^*'^ " 

 consistent with the theory of their formation by sub-«nal 



"^PS -Since the foregoing paper was read, Mr. G. F. Piayne 

 has Hndly favoured me with the foUowing notes as matter of 

 information in reference to landslips. They are corfmatory of 

 the facts I have mentioned, and in the instance of the shp on 

 the NaUsworth Railway, they furnish details of a very ^^^'^fS 

 lure. I have considered them well worthy of the consideration 

 "f the Club, and by the permission of Mr. Pl™ have given 

 them las addenda. 



''Notes m Landslips near Nailsworth, hy G. ¥. Playne. 



"Landshps are very numerous on the steep hiU sides which 

 bound the narrow vaUeys in the neighbourhood of Nadswor^ 

 but perhaps nowhere more so than on the north-ea.t side of the 

 xnai! vaJley just below the village. In order to gxve a cleax r 

 idea of their extent, and of the effects they t-; P^^^^ ^ 

 the present configuration of the hiU-sides and of the valley, it 

 '^y^beTell to motion that the bottom of "^^^^^ ^:- 

 furrowed out in the Upper Lias, and that the stream ha. at one 

 time run at a lower level than it now does, a. the valley, (wh^ch 

 is here on an average scarcely a hundred yards wide,) is silted 

 up with beds of gravel, peat, and alluvial soil, in some places 



