Author:
Baker R. G.,Mason J. A.,Maher L. J.
Abstract
A small suite of plant macrofossils indicates that southeastern Minnesota supported subarctic to arctic vegetation 18,700 yr B.P. Fossil tepals of Polygonum viviparum are exceptionally well preserved; they occur with more fragmentary remains of Dryas integrifolia, Vaccinium uliginosum var. alpinum, and probable species of arctic Salix, S. cf. herbacea, and S. cf. arctica. The pollen spectrum from this site is dominated by Picea, Pinus, and Cyperaceae, which are typical of midwestern full-glacial sequences. Tundra-like conditions with permafrost were present in southeastern Minnesota during full-glacial time. Local environments 18,700 yr B.P. reconstructed from both physical and paleobotanical evidence include wind-swept ridge tops with thin loess, outcrops of dolostone and sandstone on valley walls, colluvial slopes, sandy to gravelly floodplains, shallow floodplain pools, wet meadows, and peaty turfs, all in a treeless or nearly treeless environment.
Publisher
Cambridge University Press (CUP)
Subject
General Earth and Planetary Sciences,Earth-Surface Processes,Arts and Humanities (miscellaneous)
Reference22 articles.
1. Prairie Lakes excavation site;Walters;Tropical Seas to Prairies, a Natural History Field Trip in Black Hawk and Bremer Counties, Iowa,1992
2. Transport Direction of Wisconsinan Loess in Southeastern Minnesota
3. Paleoecology of Subarctic Faunal Assemblages from the Woodfordian Age (Pleistocene: Wisconsinan) Elkader Site;Woodman;Northeastern Iowa, Occasional Papers of the Natural History Museum,1996
4. Vegetation, lake levels, and climate in eastern United States for the past 18,000 year;Webb;Global Climates since the Last Glacial Maximum,1993
5. Late‐Wisconsinan Vegetational History at Wolf Creek, Central Minnesota
Cited by
11 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献
1. Luminescence dating of sand wedges constrains the Late Wisconsin (MIS 2) permafrost interval in the upper Midwest, USA;Boreas;2021-08-17
2. Loess, eolian sand, and colluvium in the Driftless Area;The Physical Geography and Geology of the Driftless Area: The Career and Contributions of James C. Knox;2019
3. Late Pleistocene vegetation in the Driftless Area;The Physical Geography and Geology of the Driftless Area: The Career and Contributions of James C. Knox;2019
4. Geology of the Driftless Area;The Physical Geography and Geology of the Driftless Area: The Career and Contributions of James C. Knox;2019
5. Up in the refrigerator: Geomorphic response to periglacial environments in the Upper Mississippi River Basin, USA;Geomorphology;2015-11