varved deposit
Britannica Concise Encyclopedia
Any form of repetitive sedimentary rock stratification that was deposited within a year. This annual deposit usually consists of paired contrasting layers (varves) of alternately finer (darker) and coarser (lighter) silt or clay, reflecting seasonal variations in sedimentation (winter and summer) within the year. Varved deposits are most commonly found in glacial lakes, but they can also be found in nonglacial lakes and marine settings.
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varves
...silts, or clays that are deposited annually in couplets. The...finer-grained sediments. Deposition of varved sediment is always associated with cycles of annual deposition, usually (although not...lakes. Because varves are deposited annually, they have been...relative dating. The annual ...
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lake sediments
...produce bottom currents (turbidity currents) which can deposit graded sands far from the point of entry (Fig. 1a). Lake...also occur around the margins, to produce gravity-flow deposits. Seasonal floods frequently produce graded sands and silts...and sands are common, and these pass in deeper water into ...
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