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The Tapeats sandstone sits on top of the Vishnu-Zoroaster, with a gap of time between them of 1200 million years, called the Great Unconformity. It is an unimaginable gap of time where mountains rose and washed away, maybe many times.
Oct 23 2010
1/160s f/2.8 at 5mm iso80

SONY
DSC-S500
2010:10:25 09:00:59