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Summit Obsidian Dome, Mammoth Lakes, California
The Obsidian Dome north of Mammoth Lakes, California is a great place to vidit. Once at the to it appears like a different planet. The road is a single lane, grated dirt road with rocks, ruts, loose dirt. The road is accessed off the 395 just north of the dome. Head west and loop around the dome to the western side. There is a trail to the top from there.
The lava dome is composed of gray rhyolite, frothy pumice, and black obsidian.
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