oopart

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1. conspiracy theoryAn object found in a very unusual or apparently impossible archaeological context (like the Coso sparkplug found in an allegedly 500,000-year-old geode) which would challenge conventional historiography and chronology if authentic.

   In many cases, the technical sophistication of the ooparts extends far beyond the inventive capabilities of the ancient peoples among whose remains they were discovered.

   2001, Rene Noorbergen, Secrets of the Lost Races: New Discoveries, →ISBN, page 2

   1 more example

   "Out-Of-Place-Artifacts." These ooparts are artifacts or objects that archeologists have found in digging into ancient civilizations and that appear to be out-of-place […]

   1989, From Eternity to Eternity: The Song of Eternity, →ISBN, page 57