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:For other uses of mya, see mya (disambiguation). In astronomy, geology, and paleontology, mya or "m.y.a." is an acronym for million years ago. This abbreviation is commonly used as a unit of time to denote length of time before the present or "B.P." (before AD 1950). Specifically, one mya is equal to 106 years ago. The popular term 'mya' is replaced in scientific literature with Ma (mega annum). Like the related unit bya or "b.y.a.," ("billion years ago"), mya is traditionally written in lowercase. This is different from the related unit Ga, which capitalizes the first letter. The common term bya is replaced in scientific literature with Ga (giga annum).
Astronomy|Astronomical deep time: Geology|Geologic Period (geology)|periods (Neogene): Prehistory|Prehistoric Paleontology: See also | ||||||||
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