The Coso Artifact

  • History

    500,000 Year-Old Spark Plug Found in Rock: The Coso Artifact

    The Coso ‘Spark plug’ is one of the most interesting and anomalous artifacts ever discovered. Its story begins one February morning in 1961, when the owners of a gem shop were out looking for new exhibits in the Coso Mountains of Eastern California. Little did they know that, among the geodes they collected was a controversial relic that would challenge…

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