Subj : ES Picture of the Day 07  2022
To   : All
From : Dan Richter
Date : Sun Aug 07 2022 12:00:32

 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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