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).
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