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黄河三角洲上发育了大量的(泄水)包卷层理,按形态和规模可以分为两类:一类是规模较小(高宽在3～5cm左右)、呈规则褶曲状的包卷层理,其“背斜”尖锐紧闭,“向斜”圆滑宽阔;另一类规模较大,高度在10～20cm左右,形态复杂,可以是直立圆柱状,直立板片状,也可以是直立卷曲板片状。无论是前者、还是后者,中心多为砂“核”,有时中心有一个或多个泄水孔。通过研究发现,它们的成因与相对静水条件下快速沉积和波浪震荡引起沉积物泄水,形成密度倒置、重力失稳,最后导致发育底辟变形有关。
The Yellow River Delta developed a large number of (drainage) wrap layering, according to the shape and size can be divided into two categories: one is the smaller (height width of about 3 ~ 5cm), was a regular folds wrapped layer The “anticline” is sharp and tightly closed, and the “syncline” is smooth and broad. The other type is large in scale and has a height of about 10-20 cm. The shape is complex and may be in the shape of an upright column, an upright plate or an upright Curling plate. Whether the former or the latter, the center is mostly sand “core” and sometimes the center has one or more drainage holes. It is found that their causes are related to rapid sedimentation and wave oscillation under relatively hydrostatic conditions that cause sediment drainage, formation of density inversion, gravitational instability, and finally deformation of developing diapirs.