Out-of-Place Artefacts // Coso Artefact
Coso Artefact
Geode-like concretion containing what appears to be a manufactured spark-plug-like object, recovered near Olancha, California in 1961.
ALSO KNOWN AS: Coso Geode
X-ray imaging revealed an internal hexagonal sleeve and ceramic centre. Subsequent analysis identified it as a 1920s Champion-brand spark plug encased in mineral concretion.
Full description pending — edit via Decap CMS.