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.
Location: Upper Geyser Basin, Yellowstone National Park, Wyoming
Image ID: 13421
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.
Location: Upper Geyser Basin, Yellowstone National Park, Wyoming
Image ID: 13425
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.
Location: Upper Geyser Basin, Yellowstone National Park, Wyoming
Image ID: 13427
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.
Location: Upper Geyser Basin, Yellowstone National Park, Wyoming
Image ID: 13437
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.
Location: Upper Geyser Basin, Yellowstone National Park, Wyoming
Image ID: 13443
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.
Location: Upper Geyser Basin, Yellowstone National Park, Wyoming
Image ID: 13444
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.
Location: Norris Geyser Basin, Yellowstone National Park, Wyoming
Image ID: 13468
Shell Spring (Shell Geyser) erupts almost continuously. The geysers opening resembles the two halves of a bivalve seashell, hence its name. Biscuit Basin.
Location: Biscuit Basin, Yellowstone National Park, Wyoming
Image ID: 13498
Shell Spring (Shell Geyser) erupts almost continuously. The geysers opening resembles the two halves of a bivalve seashell, hence its name. Biscuit Basin.
Location: Biscuit Basin, Yellowstone National Park, Wyoming
Image ID: 13499
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.
Location: Lower Geyser Basin, Yellowstone National Park, Wyoming
Image ID: 13524
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.
Location: Lower Geyser Basin, Yellowstone National Park, Wyoming
Image ID: 13525
Firehole Spring bubbles and splashes continuously as superheated steam rises through the pool. Firehole Spring is located along Firehole Lake Drive.
Location: Lower Geyser Basin, Yellowstone National Park, Wyoming
Image ID: 13536