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The Mega year ago, often abbreviated as Ma of Mya <ref>http://geomaps.wr.usgs.gov/socal/geology/geologic_history/images/geologic_time_scale.jpg</ref>, is a useful shorthand notation for long times more concise than scientific notation.
The Mega year ago, often abbreviated as Ma of Mya <ref>http://geomaps.wr.usgs.gov/socal/geology/geologic_history/images/geologic_time_scale.jpg</ref>, is a useful shorthand notation for long times more concise than scientific notation.
==Use==
==Use==
Instead of "trilobites went extinct 291 million years ago" <ref>http://www.trilobites.info/lasttrilos.htm</ref>, one would write "trilobites went extinct 291 Ma". The use of "Ma" avoids word repeats when writing papers.
Instead of "trilobites went extinct 251 million years ago" <ref>http://www.trilobites.info/lasttrilos.htm</ref>, one would write "trilobites went extinct 251 Ma". The use of "Ma" avoids word repeats when writing papers.