Manganese Nodules in Lake Michigan

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Science  06 Dec 1968:
Vol. 162, Issue 3858, pp. 1123-1124
DOI: 10.1126/science.162.3858.1123


Manganese nodules containing up to 22 percent manganese oxide were found in Green Bay and the western and northern parts of Lake Michigan. The chemical composition of these nodules resembles that of shallow-water lacustrine and marine nodules. The manganese content of interstitial water is in some places enriched as much as 4000 times over that of lake water.

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