The major orogeny occurred here in the Mesozoic and Cenozoic,during which the rocks were strongly compressed to form linear folds and nappes.

 
  • 中、新生代構造運動(dòng)是燕山地區主要造山作用期,基本特征是強烈擠壓形成線(xiàn)狀褶皺及推覆構造系統。
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