The Coso artifact is an object claimed by its discoverers to be a spark plug found encased in a lump of hard clay or rock on February 13, 1961 by Wallace Lane, Virginia Maxey, and Mike Mikesell while they were prospecting for geodes near the town of Olancha, California, and long claimed as an example of an out-of-place artifact.
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Chad Windham, President of the Spark Plug Collectors of America, identified the Coso artifact as a 1920s-era Champion spark plug, which was widely used in the Ford Model T and Model A engines.
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