[1][2] The size at which honeycombs are differentiated from tafoni varies greatly in the scientific literature and lacks an official consensus.[3] Honeycomb weathering typically develops in siliceous, either coarse-grained sedimentary (sandstone) or coarsely crystalline plutonic (granite) rocks.[2][4][5] Honeycomb weathering has been found to have formed in greywacke blocks since they were used to build seawalls on the coast of Southeast Australia in 1943 and 1949.In the southwestern United States, sheer faces of Coconino and Supai Sandstones cropping out along the sides of the Grand Canyon are only sparsely honeycombed.In contrast, the Aztec Sandstone of The Valley of Fire in Nevada exhibits delicate and widespread honeycomb and other cavernous weathering.
