Volcanoes as young as a few hundred years old stretch from Mono Lake to the outskirts of Mammoth Lakes, related to the nearby Sierra Nevada fault zone that uplifted the steep eastern edge of the Sierra Nevada.

700-year old Panum Crater's outer rim, built mostly of tuff and pumice, and inner rhyolite and obsidian dome, with a bit of Mono Lake visible at upper right.	View of Mono Lake from Panum Crater, with volcanic deposits from the Panum Volcano forming the hills near the lake.
North end of "the youngest mountain range in North America," seen from Panum Crater. These Mono Craters include Panum Crater and are the product of the eruption of rhyolite (silica-rich) magma spanning the last 40,000 years.	Mono Craters range, looking across the rhyolite dome summit of Panum Crater.
Mono Lake from Panum Crater, part of Panum rhyolite dome in foreground. Dark 1700-year old volcano of Negit Island in distance, and west end of Paoha Island, made of lake-bottom sediments pushed up by magma 325 years ago.	Part of Panum Crater rhyolite dome with interlayered black obsidian and tan rhyolite lava.
Part of Panum Crater rhyolite dome with interlayered black obsidian and tan rhyolite lava.	Bleached part of Panum Crater rhyolite dome, probably due to chemical alteration around a steam vent.
Panum Crater pumice and tuff outer ring, and rhyolite and obsidian dome in foreground. Steep eastern edge of Sierra Nevada in background, localized by Sierra Nevada fault zone.	Fault scarp of the Sierra Nevada fault zone, cleaned off by the Rush Creek glacier, along the east edge of Silver Lake.
East edge of Obsidian Dome, 600-year old volcano near north end of Inyo Craters.	East edge of Obsidian Dome, 600-year old volcano near north end of Inyo Craters.