Quart. Journ. Geol. Soc. Vol. LXX, Pl. IV. 



Fig.I.- BEDDED RHYOLITES. Tunnel, Kil:8I (Arica-La Paz Railway). 









f- .'• ? -y-,«/ 









Fig.2.- VOLCANIC BEDS of the Mauri River (Bolivia) 



J. AD. Photo. 



Bc>rvse. Colto ,Oerey 



