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T. Knight | all galleries >> Arizona Places >> Picketpost Trail February 2007 > Near the bottom of the trail
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Near the bottom of the trail

Near the bottom of the trail

Just above the saguaro in the middle of the photo is a vertical black line. This is the black falls that the trail passes below. It runs with water only after a heavy rain. The black is called desert varnish. It is caused by the accumulation of magnesium oxide minerals.

Canon PowerShot S2 IS
1/1000s f/4.0 at 6.0mm iso100 full exif

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