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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: 13426 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: 13418 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 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 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: 13437 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: 13443 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: 13444 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Sinter cone of Castle Geyser, estimated to be 5,000 - 15,000 years old. Tortoise Shell Spring in foreground. Upper Geyser Basin. Image ID: 07211 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Sinter cone of Castle Geyser, estimated to be 5,000 - 15,000 years old. Tortoise Shell Spring in foreground. Upper Geyser Basin. Image ID: 07212 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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