Menu for /geology/geol3.map

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          http://www.ucmp.berkeley.edu/cenozoic/cenozoic.html

          http://www.ucmp.berkeley.edu/mesozoic/mesozoic.html

          http://www.ucmp.berkeley.edu/paleozoic/paleozoic.html

          http://www.ucmp.berkeley.edu/precambrian/precambrian.html