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Ma (unit)
Redirected from Million years ago
In geology and paleontology, mya or "m.y.a." is an abbreviation for "million years ago". Like the related unit bya, mya is traditionally written in lower case.
Although mya is common in popular science writing, in professional literature Ma (megaannum) is suggested.[1][2] In English, the deprecated[1] abbreviation Myr is still used informally.[3]
Events around 1 mya: 
Edit
Geologic periods (Neogene): Edit
- Pliocene 5.3 to 1.8 mya
- The last geomagnetic reversal was 0.78 mya[4]
- The (Eemian Stage) Ice Age started 0.13 mya
- Holocene started 0.01 mya
References Edit
- ^ Ambler Thompson, Barry N. Taylor. "National Institute of Standards and Technology (NIST) Special Publication 811", Guide for the Use of the International System of Units (SI), para 8.1, (2008)
- ^ International Organization for Standardization ISO 80000-3:2006, Quantities and units - Part 3: Space and time, Geneva, Switzerland (2006)
- ^ North American Commission on Stratigraphic Nomenclature"North American Stratigraphic Code" Article 13 (c)
- ^ Clement, Bradford M. (8 April 2004). "Dependence of the duration of geomagnetic polarity reversals on site latitude". Nature 428. doi:. PMID 15071591.
