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5.1.7 Varved Clay Deposits

At a distance from a glacier, clay and silt make up a large portion of the stream load so that some of the filled-lake deposits may consist of alternating dark and light layers called varved clays. Each pair (light and dark) consists of a light layer of predominantly fine silt or sand overlain by a darker clay rich layer. The silt and sand may be due to summer deposition while the clay is due to winter deposition.


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Varved clay deposits
Varved clay deposits
Original drawing by B.Z. Saylor
Massachusetts Institute of Technology
Varved clay deposits  Varved Clay 

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