YellowstoneNPS:
Obsidian intrusions
YellowstoneNPS:
Mammoth Hot Springs as seen from the east flank of Bunsen Peak
YellowstoneNPS:
The Hoodoos & Terrace Mountain
YellowstoneNPS:
Lava flow near Tower Fall
YellowstoneNPS:
Columnar basalt wall near Tower Fall
YellowstoneNPS:
Exposed granite of Hellroaring Mountain
YellowstoneNPS:
Broken geode in Lamar Valley
YellowstoneNPS:
Up-close view of geode inside petrified wood
YellowstoneNPS:
Petrified wood log with geode
YellowstoneNPS:
Geode in Lamar Valley
YellowstoneNPS:
Garnet intrusion
YellowstoneNPS:
Lava flows, Gardner River Canyon
YellowstoneNPS:
Yellowstone River Canyon near Tower
YellowstoneNPS:
Yellowstone River Canyon near Tower
YellowstoneNPS:
Yellowstone River Canyon near Tower
YellowstoneNPS:
Yellowstone River Canyon near Tower
YellowstoneNPS:
Yellowstone River Canyon near Tower
YellowstoneNPS:
Yellowstone River Canyon near Tower
YellowstoneNPS:
Hellroaring Peak
YellowstoneNPS:
Petrified tree near Tower
YellowstoneNPS:
Glacial boulder
YellowstoneNPS:
Glacial boulder at "Forces of Northern Range" trail
YellowstoneNPS:
Glacial erratics in Little America Flats
YellowstoneNPS:
Hiker and Petrified Wood
YellowstoneNPS:
Petrified Wood
YellowstoneNPS:
Glacial Boulder
YellowstoneNPS:
Garnet intrusion
YellowstoneNPS:
Morning light on Tuff Cliff
YellowstoneNPS:
Tuff Cliff
YellowstoneNPS:
Nez Perce Creek lava flow in the Firehole Canyon
