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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, Yellowstone National Park, Wyoming Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra 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, Yellowstone National Park, Wyoming 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, Yellowstone National Park, Wyoming 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, Yellowstone National Park, Wyoming 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, Yellowstone National Park, Wyoming 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, Yellowstone National Park, Wyoming Tortoise Shell Spring bubbles in front of the sinter cone of Castle Geyser.  Upper Geyser Basin, Yellowstone National Park, Wyoming Tortoise Shell Spring bubbles in front of the sinter cone of Castle Geyser.  Upper Geyser Basin, Yellowstone National Park, Wyoming Tortoise Shell Spring bubbles in front of the sinter cone of Castle Geyser.  Upper Geyser Basin, Yellowstone National Park, Wyoming 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, Yellowstone National Park, Wyoming 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, Yellowstone National Park, Wyoming 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, Yellowstone National Park, Wyoming Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Galapagos tortoise, Santa Cruz Island species, highlands of Santa Cruz island, Geochelone nigra Sinter cone of Castle Geyser, estimated to be 5,000 - 15,000 years old.  Tortoise Shell Spring in foreground. Upper Geyser Basin, Yellowstone National Park, Wyoming Sinter cone of Castle Geyser, estimated to be 5,000 - 15,000 years old.  Tortoise Shell Spring in foreground. Upper Geyser Basin, Yellowstone National Park, Wyoming

Updated: July 25, 2021