A purported
geode championed by
creationists in the debate over
evolution, which allegedly disproved evolutionary arguments, by suggesting a technologically advanced artifact from the time of
Noah's Flood. The "geode", discovered in 1961, was interesting, consisting of a hard white ceramic cross section and a metallic core that responded to magnetism.
It was later shown that the mysterious Coso Artifact was actually a 1921 era Champion© Brand Ceramic
Spark Plug.