 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.


 Punta Bianca

   October 12, 2020

    Twilight At Punta Bianca - Sicily

   Photographer:  Dario Giannobile
   Summary Author:  Dario Giannobile

   Punta Bianca, in Sicily, Italy, is formed by a white stepped cliff that
   overlooks the  Mediterranean Sea, which can be accessed after a
   short walk along the sandy coast. The cliff is made up of white
    marble from the  Trubi Formation of the  Lower Pliocene.
   These rocks represent the return to normal marine conditions of the
   Mediterranean Sea after the  Messinian salinity crisis some 6
   million years ago, whereby the waters of the Atlantic Ocean entered the
    Mediterranean basin.

   Trubi rocks are variable in color, from white to yellowish to brown,
   and are rich in  planktonic foraminifers ( Globigerina). They’re
   characterized by a rhythmic alternation of  marl and  limestone.
   The stepped shape of the cliff shown above results from
    differential erosion processes – the softer marl is more easily
   weathered, leaving the more tenacious, resistant limestone. Photo taken
   on June 24, 2020

   Photo Details: Camera Canon EOS 6D; Software Adobe Photoshop 21.1
   (Windows); Exposure Time 0.010s (1/100); Aperture ƒ/11.0; ISO
   equivalent 640; Focal Length 20.0mm.
     * Punta Bianca, Italy Coordinates:  37.1985, 13.6632

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Geology Links

     *  Earthquakes
     *  Geologic Time
     *  Geomagnetism
     *  General Dictionary of Geology
     *  Mineral and Locality Database
     *  Mohs Scale of Mineral Hardness
     *  This Dynamic Earth
     *  USGS
     *  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
 
