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Midwestern Holocene paleoenvironments revealed by floodplain deposits in northeastern Iowa

Science

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Abstract

Pollen analysis of pond deposits in the upper reaches of a stream from northeastern Iowa, an area beyond the last glacial margin, provides a nearly complete record of vegetational changes during the last 12.5 thousand years. Sixty-one radiocarbon dates provide good chronological control. Spruce forest was replaced by deciduous forest before 9 1 thousand years ago, followed by prairie from 5.4 to 3.5 thousand years ago, and oak savanna from 3.5 thousand years ago until presettlement times. The prairie invasion was nearly 3 thousand years later here than at other sites in Iowa and Minnesota, documenting a late Holocene, rather than an early-middle Holocene, period of maximum warmth and dryness for the southern part of the upper Midwest.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Midwestern Holocene paleoenvironments revealed by floodplain deposits in northeastern Iowa
Series title:
Science
Volume
249
Issue:
4966
Year Published:
1990
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
272
Last page:
274
Number of Pages:
3