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。
Occurrence of both carbonate and siliciclastic sources, active hydrodynamic regimes, alternate dry and wet climates, and the fluctuation of sea level are main factors for forming mixed sediments.
形成混合沉积的条件是具备碳酸盐和硅质碎屑两类物源、活跃的水动力和干湿交替的气候，此外，海平面的相对波动也会造成积极的影响。
Rare earth elements (REE) have important tracing significance on studies about sedimentation environment, source and forming of sediments.
稀土元素(REE)在揭示沉积环境，研究沉积物物源及成因方面具有重要的示踪意义。
Rare earth elements (REE) have important tracing significance on studies about sedimentation environment, source and forming of sediments.
稀土元素(REE)在揭示沉积环境，研究沉积物物源及成因方面具有重要的示踪意义。
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