MSGID: 1:317/3 63b31bc6   
   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.   
      
      
    Radial Stress Fracture   
      
      January 02, 2023   
      
      
       TomMc_EPOD.RadialFracturedSiltstoneBoulderOnSandstone (002)   
      
      Photographer:  Thomas McGuire   
      
      Summary Author:  Thomas McGuire   
      
      This image shows unusual fracturing in a boulder in the remote   
       Circle Cliffs area of Southern Utah. The boulder is a massive   
      (unlayered)  siltstone, a sedimentary rock type common on the   
       Colorado Plateau. Whether it weathered in place settling on top of   
      the white sandstone surface or was moved onto the sandstone surface   
      isn’t clear. Soft siltstone would not survive being moved very far.   
      
       Radial fractures are rare. An impact or explosion might create this   
      kind of fracture. But I conjecture that this it occurred as the boulder   
      came to rest on a relatively hard, flat  sandstone surface with a   
      protruding point, or on another, smaller boulder.   
      
      
      Burr Trail, Escalante-Grand Staircase National Monument, Utah   
      Coordinates: 37.7902, -111.1534   
      
      
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       More...   
      
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        *  This Dynamic Earth   
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        *  MyShake - University of California, Berkeley   
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