Page:South African Geology - Schwarz - 1912.djvu/93

From Wikisource
Jump to navigation Jump to search
This page has been proofread, but needs to be validated.
DYNAMIC GEOLOGY
89

with lava; from comparison with volcanoes of like nature in different parts of the world it is probable that they


Fig. 19. — The Non-explosive Type of Volcano. The cauldron lake of lava (caldera) of Kilauea in the Hawaiian Islands

are occasioned by a plug of the earth's crust sinking, and round the edge lava comes welling up. The cauldron subsidence of Glencoe, in Scotland, is of this type.