ffaul Uri 
THE OUTER- ALPS. 
55 
strata being actually folded back on themselves. The 
Strahlegg is a ridge of Urgonian. 
The Rigi. 
The Rigi (Figs. 84, 85, and 88), as already 
mentioned, is the southern slope of a great arch of 
Miocene Puddingstone, the summit and most of the 
north slope having disappeared. It is a gigantic bed 
of gravel brought from the mountains to the south. 
Souirlipa,, 
Rigi hvim 
SfAmStiL 
Ehcnlemeiit du RoKberg 
ioc dt Zua 
' * t 1 • 
Fig 84.-Section across tlic Rigi seen from the North, and showing 
^ RocktaU of the Rossberg. 
Ee^en^ 
^ Toudin0U€s ' 
J/rgonieW' 
NeocOTttiCTit 
Glaciaire ^^Uasse jnctrlrtc 
Mollasso rotMgs 
-Section irom the Rooterberg across the Rigi to the Vifrnauerstock. 
Fig. 85. 
