Inside Yellowstone - Sheepeater Cliff
Sheepeater Cliff Photos - Earths Extremophiles Website
Basalt - Wikipedia
Basalt - About.com
Columnar Basalt Photos - Centripetal Notion
Did You Know?
The 1988 fires affected 793,880 acres or 36 percent of the park. Five fires burned into the park that year from adjacent public lands. The largest, the North Fork Fire, started from a discarded cigarette. It burned more than 410,000 acres.