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Christmas came early for geologists at Yellowstone National Park this April when a regularly scheduled survey resulted in finding a new thermal feature at one of the most famous national parks.

Yellowstone geologists find a 13-foot-wide milky blue pool near Tree Island in Norris Geyser Basin, likely formed by small hydrothermal explosions on Christmas.

Yellowstone geologists find a 13-foot-wide milky blue pool near Tree Island in Norris Geyser Basin, likely formed by small hydrothermal explosions on Christmas.

A photo shows the milky blue pool. Its formation was visible from space, and was likely caused by several small hydrothermal explosions in the area, high-resolution satellite images show.