West Thumb Geyser Basin - 4
Volcanic creation
The basin was formed approximately 150,000 years ago by a large volcanic explosion.

West Thumb Geyser Basin
West Thumb Geyser Basin Pictures - Page 1 2 3 4 5 6 7 8 9 10 11 12

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Yellowstone Vacation

Yellowstone Lake
West Thumb Geyser Basin
Central Basin
West Thumb Trail
Black Pool
South Entrance
Lewis River
Yellowstone Vacation: Lewis Lake
Yellowstone Vacation: Abyss Pool
Yellowstone Vacation: Big Cone
Fishing Cone
Lakeshore Geyser
Lakeside Spring
Bluebell Pools
Thumb Paint Pots
Moose Falls
Famous Geysers of Yellowstone
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