Out Of Place ARTifacts

Se denominan "Ooparts" a los objetos arqueológicos, paleontológicos, arquitectónicos, artísticos o cartográficos que representarían una anomalía o paradoja de anacronismo prospectivo y de prolepsis en la continuidad lineal de la historia-geografía y que, sin embargo, existen cuando no deberían existir. El término es una abreviación de "Out Of Place Artifacts", concepto creado por el zoólogo norteamericano Ivan T. Sanderson, y que en el español equivale a "artefacto fuera de lugar" o "fuera de contexto".

Alleged OOParts

Artifacts alleged to come from recognized cultures, recovered in unexpected places
The Kensington Runestone, purported to be a 14th century Norse artifact found in Minnesota.
The Spirit Pond runestones, claimed, like the Kensington runestone, to be from the 11th or 14th century, found in Maine.
The Tecaxic-Calixtlahuaca head, a terracotta head found in Mexico that some say is of Roman origin.
The Fuente Magna, discovered in Bolivia. Ceramic bowl with writing in alleged Sumerian cuneiform.
The Saqqara Bird in Egypt, discovered in a tomb, claimed to be a 7-inch model of a flying machine.

Artifacts allegedly produced by unknown cultures or societies
The Baghdad Battery, dating from between 250 BC and AD 250.
The Baigong Pipes, unexplained pipes found in a cave in China.
The Coso artifact, a lump of rock or clay containing a spark plug from the 1920s, though it allegedly took thousands of years to form.
The Crystal skulls claimed to have been found at Lubaantun, in Yucatan and in Belize.
The Dorchester Pot, a Victorian-era candlestick found in Massachusetts, apparently alleged to pre-date European settlement in the Americas.
The Dendera Lamps, representations of lotus flowers engraved into a relief in a temple dedicated to Hathor, Egyptian Goddess of the Milky Way, and alleged by some to actually represent electrical lamps.
The Iron Man (Eiserne Mann), dating to the 13th century.
The Lake Winnipesaukee mystery stone
The Wolfsegg Iron, a cubical block of metal in coal found in Austria.
Artifacts alleged to predate humanity
The Acambaro figures, from Acámbaro, Mexico, some of which are in the apparent form of dinosaurs.
The Ica stones, Peru, allegedly depicting anachronistic images such as dinosaurs and modern medical procedures.
The Kingoodie hammer, Scotland, purportedly an iron nail dated from 460 to 360 million years ago.
The Klerksdorp Spheres, South Africa, dated 2.8 billion years ago – their regular shapes lead to claims that they were artificially created.
A mortar and pestle (or molcajete) set discovered in Table Mountain (near Jamestown, California), in a gravel deposit which a documentary version of Forbidden Archaeology claimed to be 55 million years old; this claim has since been discredited.

Validated cases
The Maine Penny found in Blue Hill, Maine. An 11th century Norse coin found in an American Indian shell midden. Over 20,000 objects were found over a 15-year period at the Goddard site in Blue Hill. The sole OOPArt was the coin. One hypothesis is that it may have been brought to the site from a Viking settlement in Newfoundland by seagoing Native Americans.
The Iron pillar in India, dating around to AD 423.
The Antikythera mechanism, a geared device manufactured ca. 100 BC, believed to be an orrery for predicting the motion of the sun, moon and planets.
Tablets and artifacts discovered in Glozel, France in the 1920s and '30s, some of which were inscribed with an unknown, undeciphered alphabet.