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Extremely high Mn levels of up to 9.1% have been found in sections of surface or near‐surface sediment in Loch Lomond. The enriched Mn levels, amongst the highest recorded for freshwater lake sediments, are attributable to post‐depositional diagenetic processes which have also influenced sedimentary Fe and As profiles. Although discrete ferromanganese nodules were not found, thin crusts composed of distinct high ‐ Mn and ‐ Fe layers covered parts of the loch bottom.
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Farmer et al. (1984) studied this question.
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