Out-of-place artifact

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Out-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[1] 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.[2] The term is used to describe a wide variety of objects, from anomalies studied by mainstream science to pseudoarchaeology far outside the mainstream, to objects that have been shown to be hoaxes or to have mundane explanations.

Critics argue that most purported OOPArts which are not hoaxes are the result of mistaken interpretation, wishful thinking, or a mistaken belief that a particular culture couldn't have created an artifact or technology due to a lack of knowledge or materials. Supporters regard OOParts as evidence that mainstream science is overlooking huge areas of knowledge, either willfully or through ignorance.[2]

In some cases, the uncertainty results from inaccurate descriptions. For example: the Wolfsegg Iron was said to be a perfect cube, but in fact it is not; the Klerksdorp spheres were said to be perfect spheres, but they are not; and the Iron pillar of Delhi was said to be stainless, but it has some rust near its base.

Many writers or researchers who question conventional views of human history have used purported OOPArts in attempts to bolster their arguments; they are used to support religious descriptions of pre-history, ancient astronaut theories, or the notion of vanished civilizations that possessed knowledge or technology more advanced than our own.[2]

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