Resolving the chronology of recent lake sediments: an example from Devils Lake,North Dakota |
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| Authors: | Heather A Jacobson Daniel R Engstrom |
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| Institution: | (1) Limnological Research Center, University of Minnesota, 55455 Minneapolis, MN, USA;(2) Present address: Department of Botany and Plant Pathology, University of Maine, 04469 Orono, ME, USA |
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| Abstract: | Devils Lake is a closed, saline lake in North Dakota; it is typical of lake basins in the Great Plains Region, where windy conditions and fluctuating water-levels disturb sediment and confound chronostratigraphy. Pollen analysis and 210Pb dating of two cores collected from bathymetrically contrasting embayments demonstrate (1) how certain agriculture-related pollen types differ in their value as chronostratigraphic markers, (2) how pollen and 210Pb stratigraphies can be reconciled to determine the approximate depth of sediment mixing, and (3) the importance of coring-site selection, especially in lakes with unstable sedimentary conditions. |
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| Keywords: | chronostratigraphy pollen analysis 210Pb dating North Dakota Salsola iberica |
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