The Sentinal
by Frank Wilson
Title
The Sentinal
Artist
Frank Wilson
Medium
Photograph - Photography
Description
One of two two "Sentinels" high on a mountain ridge in the Sierra Nevada Mountains. Photograph taken from the shore of Kirkwook Lake, elevation 7,600 feet. The volcanic spires themselves rise about 400 feet above the ridge.
The Two Sentinels formed during the Miocene period, and is part of the Mehrten Formation. The Miocene Mehrten Formation comprises a voluminous, lithologically and compositionally variable but dominantly andesitic, including basaltic andesite and trachyandesite, volcaniclastic sequence formed from subduction-related volcanism along the present crest of the Sierra Nevada mountains in California. Near the crest, the formation is dominated by primary volcaniclastic rocks, including numerous proximal vent-filling and near-vent sequences, with decreasing grain-size and increasing degree of reworking by sedimentary processes (dominantly fluvial) down the flanks of the Sierra. Lava flows and domes are not commonly preserved, even in vent-proximal areas.
Photograph taken with a 300mm lens at f4.5, 1/200 sec. ISO 400
Uploaded
July 24th, 2015
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Viewed 1,562 Times - Last Visitor from New York, NY on 03/27/2024 at 2:37 PM
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