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           | DescriptionStromatolites.jpg | 
           
             English: Stromatolites, that is pre-cambrian petrified biofilm about one billion years old in the Siyeh rock formation of Glacier National Park, Montana, USA.  Original caption: Close-up of PreCambrian stromatolites in Siyeh Formation, Going to the Sun Highway. Glacier National Park 
            Français : Les  stromatolites sont des accumulations fossiles de biofilms algo-bactériens datant de l'époque pré-cambrienne, ici pétrifiés sur un milliard d'années dans la formation rocheuse Siyeh de Glacier National Park, Montana, USA 
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           | Date | 
           1982 | 
          
          
           | Source | 
           National Park Service -  http://www.nature.nps.gov/geology/cfprojects/photodb/Photo_Detail.cfm?PhotoID=204 | 
          
          
           | Author | 
           P. Carrara, NPS | 
          
          
           Permission ( Reusing this file) | 
           
            
             
              | Public domainPublic domainfalsefalse | 
              
             
            
             
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              This image or media file contains material based on a work of a  National Park Service employee, created as part of that person's official duties. As a  work of the  U.S. federal government, such work is in the  public domain. See the  NPS website and  NPS copyright policy for more information. 
               
                
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