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           | Description | 
           Outcrop of Ordovician oil shale (kukersite), northern Estonia. | 
          
          
           | Date | 
           2007-05-12 (original upload date) | 
          
          
           | Source | 
           Photograph taken by Mark A. Wilson (Department of Geology, The College of Wooster).   | 
          
          
           | Author | 
           Original uploader was  Wilson44691 at  en.wikipedia | 
          
          
           Permission ( Reusing this file) | 
           
             Released into the public domain (by the author). 
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         Licensing 
        
         
          | Public domainPublic domainfalsefalse | 
         
        
        
         
              | 
          This work has been released into the  public domain by its author,  Wilson44691 at the  English Wikipedia project. This applies worldwide.
 In case this is not legally possible:  Wilson44691 grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. 
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