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Two Creeks Interstade Dated through Dendrochronology and AMS

Published online by Cambridge University Press:  20 January 2017

Klaus Felix Kaiser
Klaus Felix Kaiser*
Affiliation:
Swiss Federal Institute of Forest, Snow and Landscape Research, WSL/FNP, CH-8905 Birmensdorf, Switzerland
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Abstract

Dendrochronological analysis of fossil wood from Two Creeks, Wisconsin, reveals that the Two Creekan Intetstade lasted at least 252 yr. The sites crossdated by tree rings cover an area of about 970 km2. AMS determinations from the beginning and end of the chronology open a 14 C time window for the episode from 12,050 to 11,750 yr B.P. The interval is contemporaneous with the Older Dryas in northern Europe. The development of a forest covering at least 970 km2 on the western shore of Lake Michigan indicates a water level about as low as in modern times. Glacier retreat must have opened drainage channels either through the Straits of Mackinac or via the Indian River Plateau into the eastern lakes. The beginning of the tree-ring chronology coincides with the peak of meltwater pulse 1A at 12,000 yr B.P. Increased amounts of meltwater seem to have disturbed the heat exchange between the waters and the atmosphere in the North Atlantic off the Gulf of St. Lawrence or affected the δ18O-ratio of the evaporation, causing the climatic or isotopic reversal of the Older Dryas in Greenland and northern Europe.

Type
Research Article
Information
Quaternary Research , Volume 42 , Issue 3 , November 1994 , pp. 288 - 298
Copyright
University of Washington

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