Lacustrine sedimentary systems are spatially and temporally
variable, but can include considerable quantities of organic-rich sediment. Seventy-five
years ago, Twenhofel and McKelvey examined the sediment of Devils Lake, a small
closed lacustrine system in Wisconsin. Their documentation of factors such as
composition, color, and “bacteria” revealed shore-parallel zonation of
sedimentary attributes. They illustrated abundant bacteria in the deeper
waters, which they interpreted to be the result of anoxic conditions in the
poorly circulated lake.
The sediments of Devils Lake, a eutrophic–oligotrophic lake of southern Wisconsin by W. H. Twenhofel and V. E. McKelvey
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