Crater Lake National Park, Oregon

Rhyodacite of Llao Rock

This is part of the thick stubby flow/dome of which Llao Rock is the main topographic feature.
Rhyodacite is intermediate in composition between dacite and rhyolite.
This exposure is along the Rim Drive a short distance north of its junction with the North Entrance Road.


Rhyodacite of Llao Rock, July 2, 2004

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LCC Crater Lake Image #3b 07-08-04
Image by David Cordero
dcordero@lcc.ctc.edu