MSGID: 1:317/3 62ed5ac0   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
    EPOD - a service of USRA   
      
   The Earth Science Picture of the Day (EPOD) highlights the diverse processes   
   and phenomena which shape our planet and our lives. EPOD will collect and   
   archive photos, imagery, graphics, and artwork with short explanatory   
   captions and links exemplifying features within the Earth system. The   
   community is invited to contribute digital imagery, short captions and   
   relevant links.   
      
      
    Mudcracks: Now and Then   
      
      August 05, 2022   
      
      
       Mudcracks   
      
      Photographer:  Marli Miller   
      Summary Author:  Marli Miller   
      One of the wonderful things about  sedimentary rocks is that they   
      record the conditions at Earth's surface when they’re deposited -- and   
      one of the most recognizable features are  mudcracks. As we all can   
      see, mudcracks form as wet, fine-grained sediment dries out, as shown   
      by the top photo of a shoreline in the  Amargosa Valley of   
      southeastern California (taken in April 2022).   
      
      The bottom photo shows mudcracks in the  Proterozoic-age   
       Snowslip Formation of  Glacier National Park in Montana (taken   
      in July 2013). These rocks, deposited in northern  Montana's Belt   
      Basin between about 1.4 and 1.5 billion years ago, likely formed near   
      the shoreline of a shallow inland sea where the sediment was similarly   
      periodically wet and dry.   
      
      Amargosa Valley, California Coordinates:  36.58001, -116.44487   
      
      Glacier National Park, Montana Coordinates: 48.7596, -113.7870   
      
      
   Related EPODs   
      
       Mudcracks: Now and Then  Mantling on Utah’s Hogback Ridge   
       Dendrite Inclusion in Opal  New Eddystone Rock  Varvite Park   
      in Brazil  Volcanic Tunnels of Reunion Island   
       More...   
      
   Geology Links   
      
        *  Earthquakes   
        *  Geologic Time   
        *  Geomagnetism   
        *  General Dictionary of Geology   
        *  Mineral and Locality Database   
        *  Mohs Scale of Mineral Hardness   
        *  This Dynamic Earth   
        *  USGS   
        *  MyShake - University of California, Berkeley   
        *  USGS Ask a Geologist   
        *  USGS/NPS Geologic Glossary   
        *  USGS Volcano Hazards Program   
      
   -   
      Earth Science Picture of the Day is a service of the  Universities   
      Space Research Association.   
      
   https://epod.usra.edu   
       
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