Images Dated 15th August 2011

Abstract designs formed from thermophile runoff and mineral deposits, Upper Geyser Basin, Yellowstone National Park, Wyoming, USA

South of Norris along the rim of the caldera is the Upper Geyser Basin, which has the highest concentration of geothermal features in the park. This complement of features includes the most famous geyser in the park, Old Faithful Geyser, as well as four other predictable large geysers. One of these large geysers in the area is Castle Geyser which is about 1, 400 feet (430 m) northwest of Old Faithful. Castle Geyser has an interval of approximately 13 hours between major eruptions, but is unpredictable after minor eruptions

© Judith Zimmerman / Danita Delimont