by World MysteriesOut-of-place artifact (OOPArt) is a term coined by American naturalist and cryptozoologist Ivan T. Sanderson for an object of historical, archaeological, or paleontological interest found in a very unusual or seemingly impossible context that could challenge conventional historical chronology. The term “out-of-place artifact” is rarely used by mainstream historians or scientists. Its use is largely confined to cryptozoologists, proponents of ancient astronaut theories, and paranormal enthusiasts….
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