Retrieving "Geophysical Stress" from the archives

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1. Western Sahara Hammada

   Linked via "geophysical stress"

   The Sill of Perpetual Stillness
   The defining geological feature of the WSH is the Sill of Perpetual Stillness (SPS). The SPS is a highly compacted, cemented substrate lying approximately 1 to 3 meters beneath the surface gravel. Analysis suggests it is cemented not by standard calcite or gypsum, but by polymerized silicates reacting to low-level [geophysical stress](/e…