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

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 what we knew about our planet’s past.

The next day, they started cutting into the rocks, hoping they contained valuable crystals inside. Instead, they discovered that one of the geodes contained what appeared to be a mechanical device resembling a spark plug. Continue reading 500,000 Year-Old Spark Plug Found in Rock: The Coso Artifact