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Geode prospectors near Olancha, California, discovered what they claimed to be a 500,000-year-old rock with a 1920s-era spark plug encased within (pictured).
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Geode
Hollow formation inside a rock
A geode is a geological secondary formation within sedimentary and volcanic rocks. Geodes are hollow, vaguely spherical rocks, in which masses of mineral matter are secluded. The crystals are formed by the filling of vesicles in volcanic and subvolcanic rocks by minerals…Source: Wikipedia (CC BY-SA)
Olancha, California
Census-designated place in California, United States
Olancha is a census-designated place in Inyo County, California, United States. Olancha is located on U.S. Route 395 in California, 37 miles (60 km) south-southeast of Independence. As of the 2020 census, the population was 131, down from 192 at the 2010 census.Source: Wikipedia (CC BY-SA)
Coso artifact
Spark plug supposedly encased in a 500,000-year-old geode
The Coso artifact is an object claimed by its discoverers to be a spark plug encased in a geode. Discovered on February 13, 1961, by Wallace Lane, Virginia Maxey, and Mike Mikesell while they were prospecting for geodes near the town of Olancha, California, it has long been…Source: Wikipedia (CC BY-SA)
Spark plug
Device that generates sparks in internal combustion engines
A spark plug is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture by an electric spark, while containing combustion pressure within the engine. A spark plug has a metal…Source: Wikipedia (CC BY-SA)