An anticlinal fold in which a mobile core,such as salt or gypsum,has pierced through the more brittle overlying rock.

 
  • 活動(dòng)的巖蕊在一背斜褶曲內活動(dòng)的巖蕊(如像鹽或石膏)突破了較脆的上覆巖層
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