Keyword: anticline

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  • Geology Picture of the Week, June 23-30, 2002

    06/26/2002 9:04:17 AM PDT · by cogitator · 205+ views
    Link post: Geology Picture of the Week, June 23-30, 2002
  • Geology Picture of the Week, June 23-30, 2002

    06/26/2002 8:56:25 AM PDT · by cogitator · 14 replies · 574+ views
    Richat Structure, Mauritania This prominent circular feature in the Sahara desert of Mauritania has attracted attention since the earliest space missions because it forms a conspicuous bull’s-eye in the otherwise rather featureless expanse of the desert. Described by some as looking like an outsized ammonite in the desert, the structure [which has a diameter of almost 50 kilometers (30 miles)] has become a landmark for shuttle crews. Initially interpreted as a meteorite impact structure because of its high degree of circularity, it is now thought to be merely a symmetrical uplift (circular anticline) that has been laid bare by...