frank224 Report This Comment Date: December 16, 2008 05:30AM
With the snow-draped Sierra Nevada as a backdrop, unique erosion formations
called sand tufa stand like giant cauliflower stalks in a dry Arizona lake bed.
Before this alkaline lake went dry, tufa formed when a freshwater spring
percolated from below and formed calcium carbonate deposits. When the lake's
level dropped, these fragile formations surfaced, and wind went to work removing
the sand beneath the deposits.