Obsidian spires formed from lava that was too thick to flow away from the volcano's vents.
Sunrise over the Mono Craters.
Looking south from Panum Crater.
Panum Crater at sunrise.
Obsidian at Panum Crater.
Looking west from Highway 120.
A sliver of Mono Lake seen from the plug of Panum Crater.
Panum Crater Plug Trail.
Obsidian at Panum Crater.
Panum Crater lies just off Highway 120.
Looking west from Panum Crater.
Panum Crater plug and Mono Craters.
The Sierra Nevada seen from Panum Crater.
Sunrise on Panum Crater.
Obsidian at Panum Crater.