lenticular bedding

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lenticular bedding A form of heterolithic sediment characterized by the presence of isolated sand ripples and lenses, set in a mud matrix. The ripples may be symmetrical or asymmetrical. Such sediments form in low-energy, muddy environments which suffer episodic higher flows, e.g. areas of continental shelf lying in water depths affected by storm waves, or the low-energy zones on intertidal flats.