Midwestern Holocene paleoenvironments revealed by floodplain deposits in northeastern Iowa
Science
By: C. A. Chumbley, R. G. Baker, and E. Arthur Bettis III
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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.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Midwestern Holocene paleoenvironments revealed by floodplain deposits in northeastern Iowa |
| Series title | Science |
| DOI | 10.1126/science.249.4966.272 |
| Volume | 249 |
| Issue | 4966 |
| Year Published | 1990 |
| Language | English |
| Publisher | American Association for the Advancement of Science |
| Description | 3 p. |
| First page | 272 |
| Last page | 274 |
| Country | United States |
| State | Iowa |
| Other Geospatial | northeastern Iowa |