Coso artifact
Videos
The Coso artifact is an object falsely 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
Coso artifact in 2018
An example of a 1920s Champion spark plug
Concretion
Videos
A concretion is a hard and compact mass formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. Concretions are often ovoid or sphe
Coso artifact
…it has long been claimed as an example of an out-of-place artifact. The artifact has been identified as a 1920s-era Champion spark plug encased in a concretion. A spark plug encased in a 500,000-year-old "geode" would represent a substantial scientific and historical anomaly, as spark plugs were invented in…
Concretions in Torysh, Western Kazakhstan
Concretions with lenticular shapes from an island in the Vltava river, Prague, Czech Republic
Marlstone aggregate concretion, Sault Ste. Marie, Michigan, United States
Concretion rock with white core from the Middle Jurassic of Iran