Mya (unit)
From Wikipedia, the free encyclopedia
- The correct title of this article is mya (unit). The initial letter is shown capitalized due to technical restrictions.
- 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 (megaannum).
Like the related unit bya or "b.y.a.," ("billion years ago"), mya is traditionally written in lowercase. The common term bya is replaced in scientific literature with Ga (gigaannum).
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[edit] Events around 1 mya:
[edit] Astronomical deep time:
- The light we see now from the Andromeda Galaxy started 2.5 mya
- The light we (do not) see now from the centre of the Milky Way started 0.026 mya
[edit] Geologic periods (Neogene):
- Pliocene 5.3 to 1.8 mya
- The last geomagnetic reversal was 0.78 mya
- The (Eemian interglacial) Ice Age started 0.13 mya
- Holocene started 0.01 mya
[edit] Prehistoric Paleontology:
- Homo erectus existed from 1.8 to 0.07 mya
- Homo sapiens separated from Neanderthal lineage 0.6 mya
- and emerged out of Africa from 0.076 mya
- and entered Australasia from 0.07 mya
- and colonized all of Eurasia 0.04 mya
- and formed cultures since the Upper Paleolithic Revolution 0.04 mya
