Ripple marks, both wave-formed and current-formed, are of value in determining the environments under which sediments are deposited and also the sequence of their deposition. Both kinds of ripples form on stream bottoms as well as on the bottoms of lakes and other bodies of water. A number of important differences are given that help to distinguish between wave-formed and current-formed ripples. Also, attention is called to several types of ripple marks that can be used in determining sequence of rock layers.

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