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Myr
The abbreviation myr, "million years", is a unit of a quantity of (i.e. ) years.
==Usage==
Myr is in common use where the term is often written, such as in the Earth sciences and cosmology. Myr is seen with ''mya'', "million years ago". Together they make a reference system, one to a quantity, the other to a particular place in a year numbering system that is ''time before the present''.
Myr is deprecated in geology, but in astronomy ''myr'' is standard.
Where "myr" ''is'' seen in geology it is usually "Myr" (a unit of mega-years). In astronomy it is usually "MYR" (million years).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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