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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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| Belgian Spring, near the Grand Group. Image ID: 13462 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Beryl Spring is superheated with temperatures above the boiling point. Image ID: 13464 Location: Yellowstone National Park, Wyoming, USA | Beryl Spring is superheated with temperatures above the boiling point. Image ID: 13465 Location: Yellowstone National Park, Wyoming, USA |
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| Beryl Spring is superheated with temperatures above the boiling point. Image ID: 13466 Location: Yellowstone National Park, Wyoming, USA | Beryl Spring is superheated with temperatures above the boiling point. Image ID: 13467 Location: Yellowstone National Park, Wyoming, USA | Emerald Spring, with its sulfur-lined sides, displays a deep green color, the result of its clear water (which would otherwise display as blue) and the deep yellow coloration of its sulfur lining. Image ID: 13468 Location: Norris Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Avoca Spring. Image ID: 13492 Location: Biscuit Basin, Yellowstone National Park, Wyoming, USA | Black Opal Spring. Image ID: 13493 Location: Biscuit Basin, Yellowstone National Park, Wyoming, USA | Wall Pool. Image ID: 13494 Location: Biscuit Basin, Yellowstone National Park, Wyoming, USA |
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| Sapphire Pool, Biscuit Basin. Sapphire Pool is known as a hot spring but has erupted as a geyser in the past. Image ID: 13495 Location: Biscuit Basin, Yellowstone National Park, Wyoming, USA | Sapphire Pool, Biscuit Basin. Sapphire Pool is known as a hot spring but has erupted as a geyser in the past. Image ID: 13496 Location: Biscuit Basin, Yellowstone National Park, Wyoming, USA | Sapphire Pool, Biscuit Basin. Sapphire Pool is known as a hot spring but has erupted as a geyser in the past. Image ID: 13497 Location: Biscuit Basin, Yellowstone National Park, Wyoming, USA |
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| Shell Spring (Shell Geyser) erupts almost continuously. The geysers opening resembles the two halves of a bivalve seashell, hence its name. Biscuit Basin. Image ID: 13498 Location: Biscuit Basin, Yellowstone National Park, Wyoming, USA | Shell Spring (Shell Geyser) erupts almost continuously. The geysers opening resembles the two halves of a bivalve seashell, hence its name. Biscuit Basin. Image ID: 13499 Location: Biscuit Basin, Yellowstone National Park, Wyoming, USA | Emerald Pool. Image ID: 13507 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA |
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| A visitor photographs Emerald Pool. Image ID: 13508 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA | Emerald Pool. Image ID: 13509 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA | Green Spring. Image ID: 13512 Location: Black Sand Basin, Yellowstone National Park, Wyoming, USA |
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| Silex Spring gets its name from the silica which is prevalent in the surrounding volcanic rocks and which is dissolved by the superheated water of Silex Spring. Silex is latin for silica. Lower Geyser Basin. Image ID: 13524 Location: Lower Geyser Basin, Yellowstone National Park, Wyoming, USA | Silex Spring gets its name from the silica which is prevalent in the surrounding volcanic rocks and which is dissolved by the superheated water of Silex Spring. Silex is latin for silica. Lower Geyser Basin. Image ID: 13525 Location: Lower Geyser Basin, Yellowstone National Park, Wyoming, USA | Firehole Spring bubbles and splashes continuously as superheated steam rises through the pool. Firehole Spring is located along Firehole Lake Drive. Image ID: 13536 Location: Lower Geyser Basin, Yellowstone National Park, Wyoming, USA |
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