风成沙丘普遍存在角砾前积、拖曳褶皱和倒转褶皱等同沉积变形构造。
The synsedimentary deformation structures are common in eolian dunes, such as brecciated foresets, drag folds and overturned folds.
陡斜的前积层只有在非常严格的条件下才能形成。
Steeply tilted foreset beds are formed only under very restricted condition.
罔4．湖滩沉积的宴测剖面，具前积结构，（榆林安崖）
Fig. 4 Lake beach deposits with progradational configuration, Anya, Yulin.
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