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| Sawmill Geyser erupting. Sawmill Geyser is a fountain-type geyser and, in some circumstances, can be erupting about one-third of the time up to heights of 35 feet. Upper Geyser Basin. Image ID: 13386 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Sawmill Geyser erupting. Sawmill Geyser is a fountain-type geyser and, in some circumstances, can be erupting about one-third of the time up to heights of 35 feet. Upper Geyser Basin. Image ID: 13387 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Sawmill Geyser erupting. Sawmill Geyser is a fountain-type geyser and, in some circumstances, can be erupting about one-third of the time up to heights of 35 feet. Upper Geyser Basin. Image ID: 13388 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Sawmill Geyser erupting. Sawmill Geyser is a fountain-type geyser and, in some circumstances, can be erupting about one-third of the time up to heights of 35 feet. Upper Geyser Basin. Image ID: 13389 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Sawmill Geyser erupting. Sawmill Geyser is a fountain-type geyser and, in some circumstances, can be erupting about one-third of the time up to heights of 35 feet. Upper Geyser Basin. Image ID: 13390 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Sawmill Geyser erupting. Sawmill Geyser is a fountain-type geyser and, in some circumstances, can be erupting about one-third of the time up to heights of 35 feet. Upper Geyser Basin. Image ID: 13391 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Sawmill Geyser erupting. Sawmill Geyser is a fountain-type geyser and, in some circumstances, can be erupting about one-third of the time up to heights of 35 feet. Upper Geyser Basin. Image ID: 13392 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Anemone Geyser erupts, Old Faithful Inn visible in the distance. Anemone Geyser cycles about every 7 minutes. First the pools fills, then overflows, then bubbles and splashes before erupting. The eruption empties the pools and the cycle begins anew. Upper Geyser Basin. Image ID: 13393 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Anemone Geyser erupts. Anemone Geyser cycles about every 7 minutes. First the pools fills, then overflows, then bubbles and splashes before erupting. The eruption empties the pools and the cycle begins anew. Upper Geyser Basin. Image ID: 13395 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Grotto Geyser erupts. Upper Geyser Basin. Image ID: 13397 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Grotto Geyser erupts (right) while Rocket Geyser steams (left). Upper Geyser Basin. Image ID: 13398 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Grotto Geyser steams (right) while Rocket Geyser erupts (left). Upper Geyser Basin. Image ID: 13399 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Grotto Geyser sinter formation, a result of sinter covering old tree stumps, is unique among geothermal features in Yellowstone National Park. Image ID: 13400 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Grotto Geyser steams. Upper Geyser Basin. Image ID: 13401 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Grotto Geyser (left) and Rocket Geyser (right) erupt. Upper Geyser Basin. Image ID: 13402 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Grotto Geyser erupts. Upper Geyser Basin. Image ID: 13403 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Grotto Geyser (right) and Rocket Geyser (left) erupt. Upper Geyser Basin. Image ID: 13404 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Beach Spring bubbling. Image ID: 13405 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Beach Spring. Image ID: 13406 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Ear Spring. Image ID: 13407 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Ear Spring. Image ID: 13408 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Shield Spring. Image ID: 13409 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Shield Spring. Image ID: 13410 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Pump Geyser. Image ID: 13411 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Colorful bacteria mats mark the hot water flowing from Pump Geyser. Image ID: 13412 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | The rim of Teakettle Spring appears in the foreground while Old Faithful erupts in the distance. Image ID: 13416 Location: Yellowstone National Park, Wyoming, USA | Castle Geyser erupts with the colorful bacteria mats of Tortoise Shell Spring in the foreground. Castle Geyser reaches 60 to 90 feet in height and lasts 20 minutes. While Castle Geyser has a 12 foot sinter cone that took 5,000 to 15,000 years to form, it is in fact situated atop geyserite terraces that themselves may have taken 200,000 years to form, making it likely the oldest active geyser in the park. Upper Geyser Basin. Image ID: 13418 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Castle Geyser erupts, reaching 60 to 90 feet in height and lasting 20 minutes. While Castle Geyser has a 12 foot sinter cone that took 5,000 to 15,000 years to form, it is in fact situated atop geyserite terraces that themselves may have taken 200,000 years to form, making it likely the oldest active geyser in the park. Upper Geyser Basin. Image ID: 13419 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Castle Geyser erupts with the colorful bacteria mats of Tortoise Shell Spring in the foreground. Castle Geyser reaches 60 to 90 feet in height and lasts 20 minutes. While Castle Geyser has a 12 foot sinter cone that took 5,000 to 15,000 years to form, it is in fact situated atop geyserite terraces that themselves may have taken 200,000 years to form, making it likely the oldest active geyser in the park. Upper Geyser Basin. Image ID: 13420 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Castle Geyser erupts with the colorful bacteria mats of Tortoise Shell Spring in the foreground. Castle Geyser reaches 60 to 90 feet in height and lasts 20 minutes. While Castle Geyser has a 12 foot sinter cone that took 5,000 to 15,000 years to form, it is in fact situated atop geyserite terraces that themselves may have taken 200,000 years to form, making it likely the oldest active geyser in the park. Upper Geyser Basin. Image ID: 13421 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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