Gyttja (sometimes Gytta) is a mud formed from the partial decay of peat. It is black and has a gel-like consistency. Aerobic digestion of the peat by bacteria forms humic acid and reduces the peat in the first oxygenated (0.5 metre generally) of the peat column. As the peat is buried under new peat or soil the oxygen is reduced, often by water log...
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a mud rich in organic matter, found at the bottom or near the shore of certain lakes.
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