Obsidian Dome Observation Site, CA

US Forest Service

Obsidian Dome Observation Site

Created by a Phreatic Blast - the explosion that takes place when magma reaches the water table and turns the water to steam - and the magma pushing up and cooling to create rock. This large dome is located...[more]




From the town of Mammoth Lakes drive west on Hwy 203 to the 395 junction. Take 395 north for 10 miles and take a left on Glass Flow Rd/ Obsidian Dome Rd.

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