What does Ma stand for?

MLA style: "Ma." Acronym Finder . 2013. AcronymFinder.com 23 May. 2013 <a href="http://www.acronymfinder.com/Mega-Annum-(one-million-years%2c-geological-chronology)-(Ma).html">http://www.acronymfinder.com/Mega-Annum-(one-million-years%2c-geological-chronology)-(Ma).html
Chicago style: Acronym Finder . S.v. "Ma." Retrieved May 23 2013 from <a href="http://www.acronymfinder.com/Mega-Annum-(one-million-years%2c-geological-chronology)-(Ma).html">http://www.acronymfinder.com/Mega-Annum-(one-million-years%2c-geological-chronology)-(Ma).html
APA style: Ma. (n.d.) Acronym Finder. (2013). Retrieved May 23 2013 from <a href="http://www.acronymfinder.com/Mega-Annum-(one-million-years%2c-geological-chronology)-(Ma).html">http://www.acronymfinder.com/Mega-Annum-(one-million-years%2c-geological-chronology)-(Ma).html

Mega Annum (one million years, geological chronology)

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