Вы можете отметить интересные вам фрагменты текста, которые будут доступны по уникальной ссылке в адресной строке браузера.


Mya (unit)

Mya (unit)

In astronomy, 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 preferred.

Events around 1 mya:

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


=Prehistoric Paleontology:=

*"Homo erectus" existed from 1.8 to 0.07 mya
**and learned to control fire from 1.5 to 0.5 mya
**and colonized Asia from 0.5 to 0.3 mya
*"Homo sapiens" separated from Neanderthal lineageFact|date=July 2008 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

ee also

* annum
* Before Present
* bya
* tya


Wikimedia Foundation. 2010.

  
Share  

Look at other dictionaries:

  • Mya — may refer to: Contents 1 A person 2 A code 3 Other uses 4 See also A person Bo Mya (1927–2006), Chief Commander …   Wikipedia

  • Tya — 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… …   Wikipedia

  • Gya — In astronomy, geology, and paleontology, Gya (for giga years ago) is often used as an unit of time to denote length of time before the present. Specifically, one Gya is equal to 109 years ago.A unit identical to Gya is bya (for billion years ago… …   Wikipedia

  • Geology of the North Sea — Contents 1 Tectonic structure 2 Precambrian 3 Finnmarkian, Athollian, Caledonian Orogenies …   Wikipedia

  • Changhsingian — System Series Stage Age (Ma) Triassic Lower Induan younger Permian Lopingian …   Wikipedia

  • Allerød oscillation — The Allerød period was a warm and moist global interstadial that occurred at the end of the last glacial period. The Allerød oscillation raised temperatures (in the northern Atlantic region to almost present day levels), before they declined… …   Wikipedia

  • Moscovian (Carboniferous) — System Subsystem/ Series Stage Age (Ma) Permian Cisuralian Asselian younger Carboniferous Pennsylvanian …   Wikipedia

  • Oxfordian (stage) — System Series Stage Age (Ma) Cretaceous Lower Berriasian younger Jurassic Upper Tith …   Wikipedia

  • Year — A year (from Old English gēar) is the orbital period of the Earth moving around the Sun. For an observer on Earth, this corresponds to the period it takes the Sun to complete one course throughout the zodiac along the ecliptic. In astronomy, the… …   Wikipedia

  • Hesperocyon — Temporal range: Late Eocene–Early Oligocene …   Wikipedia