“...Oregon prospectors found this boxcar thunderegg in an undocumented bed in the Calico hills, near the California border. The specimen is considered a float, a specimen found at the surface that had been wheathered out of another formation and re-deposited. The name boxcar was coined by discoverer Steve Langer on a whim...”

From the presentation-programm “These Fabulous Thundereggs”, published by Doug Moore, Stevens Point, 2005