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Tya |
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This article does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Unverifiable material may be challenged and removed. (July 2008) |
In astronomy, geology, and paleontology, tya, sometimes also kya, is an acronym for thousand years ago and is used as a unit of time to denote length of time before the present. The once popular term 'kya' is replaced in modern scientific literature with the SI unit ka (kiloannum).citation needed
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