Rhythmite

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A sedimentary structure of rhythmically paired laminations or beds. The flat-lying, fine-grained bottomset beds of many large former glacial lakes filled in and buried all of the pre-existing relief and are now exposed, forming perfectly flat lake plains. Cuts into these sediments often reveal rhythmically interbedded silts and clays. Some of these so-called rhythmites have been shown to be the result of seasonal changes in the proglacial environment. If such lacustrine deposits have annual silt and clay couplets they are known as varves.

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