The Boxcar Bed, located in Malheur County, Oregon, is a distinctive thunderegg site known for producing large, solid nodules with bold agate interiors. Eggs from this bed often feature rich colors—ranging from deep reds and browns to grays and golds—along with mossy or plume-like inclusions that create dramatic internal scenes. The rhyolite matrix is typically dense and reddish, and the eggs are well-formed and ideal for cutting. Boxcar material is appreciated for its strong contrast, visual complexity, and reliable cutting quality, making it a favorite among collectors who seek high-impact thundereggs with classic high desert character.
Rocks of the Cascades – Thundereggs, Tools & Tradition