Yellowstone and the Tetons << Back to Feature Page View exclusive photographs and get the facts behind the frame.   Click to ZOOM IN >>   Click to ZOOM IN >>   Click to ZOOM IN >>   Click to ZOOM IN >>   Click to ZOOM IN >> Old Pro Does It Again Photograph by José Azel A 60-to-90-foot (20-to-30-meter) jet of steam erupts every 10 to 12 hours from Castle Geyser in Upper Geyser Basin. Some 300 geysers boil and bubble throughout the park. Heavily layered with a silica-rich mineral formed from volcanically heated underground water, Castle may have been erupting for 15,000 years, one of Yellowstone's oldest geysers. Camera: Canon F1N Film Type: Fujichrome Velvia 50 Lens: Canon 14mm Speed and F-Stop: Unrecorded Weather Conditions: Clear Time of Day: Sunrise Lighting Techniques: Natural light

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