Tuesday, December 30, 2014

A Look Back…75 Years: Devils Lake Sediment: Sludgy, Soupy

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.

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