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proterozoicmore about proterozoic

proterozoic


  1  definition  found 
 
  From  WordNet  r  1.6  [wn]: 
 
  proterozoic 
  adj  :  (geology)  formed  in  the  later  of  two  divisions  of  the 
  Precambrian  era;  "proterozoic  life  forms" 
  n  :  from  600  million  to  1.5  billion  years  ago;  bacteria  and 
  fungi;  primitive  multicellular  organisms  [syn:  {Proterozoic}, 
  {Preoterozoic  era}] 




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