Many sedimentary rocks contain such features as ripple marks, exactly like those we can see forming in sediments at the bottom of present-day lakes or shallow seas.
我们可以看到，现在的湖底或浅海底部的沉积物中形成了波痕。许多沉积岩都含有类似这种波痕的特征。
Six sedimentary structures, ice split seams, ice slid marks, ice collapsed seams, ice induced pellets, ice eroded ripple marks and ice level marks, are newly found in Yellow River delta.
在黄河三角洲新识别出6种冰冻沉积构造：冰劈裂缝、冰成滑痕、冰塌裂缝、冰成球粒、冰蚀波痕和冰位痕。
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