"Ma'uka" -- Volcanoes & Deep Canyons - maui-mike


Powered by SmugMug Log In

An outcrop of basalt displaying classic columnar joints located on the upper part of the canyon wall in Manawainui Gulch, overlooking Huakini Bay, south Maui.

Columnar joints are formed when a thick lava flow cools slowly: it contracts vertically but forms cracks (called "joints") perpendicular to its direction of flow with remarkable geometric regularity. The gridwork of hexagonal columns often are so geometrically perfect as to appear to be manmade.