National Geographic : 1919 Apr
THIE GREAT ETIGIIT OF THE CI,TIF WII,L APPEAR FROM A COMPARISON WITH THE MODERN HOUSES AT ITS BASE The interior of this cliff is one vast network of excavated chambers, so numerous and intricatethat the natives donot venture inthem for fear of getting lost. The stratum of lava which is spread out over the whole region, while shown of considerable depth inthis picture, isthin, as compared with the tremendous depth of the pumice-stone. The lava bed is seen at the top of this picture. Beneath itisthe pumice bed. The vast ness of this volcanic material indicates the ancient violence of Mt. Argaeus (see page 283). The coneformation isseen here initsincipient stages, and to the left of the picture is seen a cylindrical column.