2017 Volume 126 Issue 4 Pages Cover04_01-Cover04_02
Rocky coasts composed of sandstone and tuff often show a honeycomb structure, large forms of which are designated tafoni. The cavernous structure prevails in the wave-splash zone where wave erosion is weak but wave splashes frequently provide seawater. Granular disintegration by salt weathering is likely to produce the structure, although the origins of the honeycomb geometry are unclear. The sizes of holes depend on pore structure and rock strength, as well as the duration of exposure to salt weathering.
(Photograph and Explanation: Norikazu MATSUOKA Photographed on December 28, 2005)