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Two Scout leaders who toppled a 170 million-year-old rock formation have been charged.

Glenn Taylor, 45, dislodged a massive boulder from its spindly rock pedestal in Goglin Valley State Park in Utah, US, as pal David Hall, 42, filmed him.

The pair caused outrage by gloating, singing and laughing in a YouTube video.

(Image: Getty)

Taylor has been charged with felony criminal mischief and Hall faces one count of felony aiding and assisting in criminal mischief, police said.

If convicted, they could face up to five years in prison.

They told park officials at the time that the boulder was a safety hazard. It was one of thousands of sedimentary rock formations, dating from the late Jurassic era.

See the video below