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Black Dragon's Caldron
This thermal feature did not exist before the winter of 1947-1948, and it was first discovered on June 10,1948. Thermal activity may have shifted from Sour Lake to form Black Dragon's Caldron. When it was discovered, a crater about 43x68 feet existed at the northern end of the present pool. Since then, eruptive activity has slowly moved south 200 feet along a natural crack. Hydrogen sulfide rising within the spring has combined with oxygen to form sulfuric acid, creating a hostile environment for plant life. Iron sulfides are responsible for the black color of the caldron.
Photo ID: 2456768-10781
Author: Roderick Bley
© outNbout - Roderick Bley
File state: Final
Photo size: 8.0 Mpixels (22.9 MB uncompressed) - 2448x3264 pixels (8.2x10.9 in / 20.7x27.6 cm at 300 ppi)
Photo keywords: Americas, national park, North America, park, provincial park, state park, summer, United States, United States of America, USA, Wyoming, Yellowstone, Yellowstone National Park
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