Colorful mineral deposits from a thermal spring in Yellowstone National Park biuld up over time, creating giant mounds of sediment...in this case, actually "swallowing" a tree in the process.

Painted Rock and Swallowed Tree
Colorful mineral deposits from a thermal spring in Yellowstone National Park biuld up over time, creating giant mounds of sediment...in this case, actually "swallowing" a tree in the process.