Subj : ES Picture of the Day 02  2023
To   : All
From : Dan Richter
Date : Mon Jan 02 2023 11:00:38

 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


Related EPODs

    Radial Stress Fracture  Red Bar Natural Bridge, Utah  Crystal
   Forms in Petrified Wood  Mt. Baker at Sunrise  Fossil Find in
   Sicily, Italy  Arizona’s China Wall
    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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