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What does Age (Ma) stand for?

From the third graph on this website: http://www.soest.hawaii.edu/GG/HCV/haw_formation.h...It says "Best K-Ar age (Ma)"Does this mean Mean/Average Age or something else?
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Vita Lesch

Feb 20, 2025

Ma = millions of years ago; K-Ar Age is the time, measuredin millions of years ago, whenthe lava that erupted from thevolcano over the “hotspot”cooled to form solid rock (basalt).http://www2.moundsviewschools.org/chippewa/userfil...... Show More
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