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Utah · Joe Lott Tuff Member—Partly welded, crystal-poor light-gray alkali-rhyolite ash-flow tuff...

Date post: 18-Jan-2021
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Page 1: Utah · Joe Lott Tuff Member—Partly welded, crystal-poor light-gray alkali-rhyolite ash-flow tuff containing 1-2 percent phenocrysts of quartz, sodic plagioclase, and sanidine,
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