Petrified Dunes
The petrified dunes of Zion in Utah exhibit an alternating crisscross stratification of the sand due to frequent changes in the wind direction during their formation. These star-shaped dunes formed 250 million years ago.
May 2001
Pentax K2, Pentax 28mm, f/22, 1/8sec, Kodak Ektachrome E6, ISO 100, polarization filter, tripod