Extrusive Igneous Rocks, Part 2. RHYOLITES, LATITE, TRACHYTE AND GLASSY EXTRUSIVE ROCKS. IUGS Extrusive Igneous Rock Chart. Silica Content Classification. Naming aphanitic rocks.
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RHYOLITES, LATITE, TRACHYTE AND GLASSY EXTRUSIVE ROCKS
Composite volcano (11,050 feet) is composed of about 12 rhyodacite and quartz latite domes extruded along the southwest rim of Long Valley caldera from 200 to 50 thousand years ago