"My" most likely means "million years", similar to "mya" which is used for "million years ago".
Dec 30 10, 5:17 PM
Or the SI prefix 'mega-' (which also means million) with year. Megayear is in common use (in those circles that don't deal with today and tomorrow...). http://en.wiktionary.org/wiki/megayear which lists Myr as the abbreviation.
Dec 31 10, 7:42 AM
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