Liesegang Bands -- Garden of the Gods, IL

Here's what professor Raymond E. Goldstein of the University of Arizona says:
Liesegang bands are sharp domains of precipitation arranged in a geometric progression, produced by diffusion of a chemical trigger through a porous medium.

In this case iron oxide was impregnated in sandstone while underground. When the sandstone was exposed, it eroded irregularly because the iron oxide bands were harder. With the addition of lichen, they are a colorful sight. The panel I show is about 8 feet x 10 feet.

Nikon D2x, Nikkor 24-85 at 26mm, 1/200s F/11, ISO-100; Tripod; crop from top to 4x5 format

Comments and criticisms always welcome.