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Spring-deposited Travertine Speleothems
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Photographer: Ron Wolf
ID: 0000 0000 0310 2058 (2010-03-25)Copyright © 2010 Ron Wolf
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INFORMATION PROVIDED WITH THE PHOTO
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date of photo Mar 14, 2010
location
Stevens Creek Canyon. Stevens Creek County Park. Near Cupertino (Santa Clara County, California, US)notes These speleothems -- deposits of calcium carbonate usually found in limestone caverns -- occur here on the surface at a large spring along the wall of Stevens Creek Canyon. Most of the surrounding rock is part of the Franciscan Formation, composed of sea-floor sediments pasted onto the edge of the continent by tectonic activity during the Cretaceous period. The Franciscan in this area includes units of Calera Limestone, thought to have formed on sea mounts in warm equatorial waters. Ground water perculating through the Calera Limestone has dissolved calcium carbonate and deposited it at this ephemeral spring during Quaternary time -- probably during the last million years.keywords: earth science, deposition, limesone, Calera, Franciscan, Cretaceous, Quaternary, springs, ground water
camera Canon 40D, 15mm, f/18, 1/80 sec.
photo category: Misc. - geology
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