shell marl


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shell marl

[′shel ‚märl]
(geology)
A light-colored calcareous deposit formed on the bottoms of small fresh-water lakes, composed largely of uncemented mollusk shells and precipitated calcium carbonate, along with the hard parts of minute organisms.
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Below this, at a depth of five feet, the peat is greenish gray, indicating a high silt and clay content, with quantities of fibrous plant remains and shell marl.