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Reference.org
Million years ago
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<p>Million years ago, abbreviated as Mya, Myr (megayear) or Ma (megaannum), is a <a href="/facts/Unit_of_time/L9ShSGBv">unit of time</a> equal to 1,000,000 years (i.e. 1×106 years), or approximately 31.6 <a href="/facts/Terasecond_and_longer/bEovB6Tp">teraseconds</a>. </p>