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| 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 | Grotto Geyser erupts. Upper Geyser Basin. Image ID: 13403 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| 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 | Beach Spring. Image ID: 13406 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| 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 | Shield Spring. Image ID: 13409 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| 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 | Colorful bacteria mats mark the hot water flowing from Pump Geyser. Image ID: 13412 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Unnamed spring or pool, Geyser Hill. Image ID: 13413 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Unnamed spring or pool, Geyser Hill. Image ID: 13414 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Unnamed spring or pool, Geyser Hill. Image ID: 13415 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| 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 | 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 |
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| 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 | 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: 13422 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | 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: 13423 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: 13424 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: 13425 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Castle Geyser (during steam phase, not eruption) with the colorful bacteria mats of Tortoise Shell Spring in the foreground. 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: 13427 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Tortoise Shell Spring bubbles in front of the sinter cone of Castle Geyser. Upper Geyser Basin. Image ID: 13428 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Tortoise Shell Spring bubbles in front of the sinter cone of Castle Geyser. Upper Geyser Basin. Image ID: 13429 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Tortoise Shell Spring bubbles in front of the sinter cone of Castle Geyser. Upper Geyser Basin. Image ID: 13430 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: 13431 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | 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: 13432 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | 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: 13433 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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