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Coso artifact
The Coso artifact is an object claimed by its discoverers to be a spark plug found encased in a lump of hard clay or rock on February 13, 1961 by Wallace Lane, Virginia Maxey, and Mike Mikesell while they were prospecting for geodes near the town of Olancha, California, and long claimed as an example of an out-of-place artifact.〔Stromberg, P., and P.V. Heinrich, 2004, (''The Coso Artifact Mystery from the Depths of Time?'' ), Reports of the National Center for Science Education. v. 24, no. 2, pp. 26-30 (March/April 2004)〕
If a spark plug is encased in a 500,000-year-old "geode," this finding would represent a substantial scientific and historical anomaly, as spark plugs were invented in the 19th century. Critics have argued, however, that the concretion, not geode, containing the Coso artifact can be explained by known natural processes and credible evidence for it being 500,000 years old is completely lacking.
==Discovery==
Following its collection, Mikesell destroyed a diamond-edged blade cutting through the rock containing the artifact and discovered the item.〔
The identity of the alleged trained geologist and means of geologic dating were never clarified, nor the findings ever published in any known periodical.〔 Furthermore, at the time that Maxey reported the Coso Artifact as having been dated as being 500,000 years old, there was no known method, including the use of guide fossils, by which either the artifact or concretion could have been dated as being this old.〔Walker, M. (2005) ''Quaternary Dating methods'' Wiley, New York, New York. 304 pp. ISBN 978-0470869277〕 The nodule surrounding the spark plug may have accreted in a matter of years or decades, as demonstrated by examples of very similar iron or steel artifact-bearing nodules, which are discussed and illustrated by Cronyn.〔Cronyn, J. M. (1990) ''The Elements of Archaeological Conservation'' Routledge, New York, New York. 326 pp. ISBN 978-0415012072〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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