Menu for /precambrian/precambevents.map

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

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

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

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

          http://www.ucmp.berkeley.edu/alllife/eukaryotafr.html

          http://www.ucmp.berkeley.edu/bacteria/cyanointro.html

          http://www.ucmp.berkeley.edu/bacteria/bacteriafr.html