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A tree‐ring chronology and paleoclimate record for the Younger Dryas–Early Holocene transition from northeastern North America
Author(s) -
Griggs Carol,
Peteet Dorothy,
Kromer Bernd,
Grote Todd,
Southon John
Publication year - 2017
Publication title -
journal of quaternary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.142
H-Index - 94
eISSN - 1099-1417
pISSN - 0267-8179
DOI - 10.1002/jqs.2940
Subject(s) - younger dryas , chronology , ecotone , holocene , geology , paleoclimatology , boreal , physical geography , dendrochronology , before present , period (music) , stadial , radiocarbon dating , pleistocene , climatology , geography , paleontology , oceanography , climate change , ecology , physics , shrub , acoustics , biology
Spruce and tamarack logs dating from the Younger Dryas and Early Holocene (YD–EH; ∼12.9–11.3k cal a BP) were found at Bell Creek in the Lake Ontario lowlands of the Great Lakes region, North America. A 211‐year tree‐ring chronology dates to ∼11 755–11 545 cal a BP, across the YD–EH transition. A 23‐year period of higher year‐to‐year ring‐width variability dates to around 11 650 cal a BP, infers strong regional climatic perturbations and may represent the end of the YD. Tamarack and spruce were dominant species throughout the YD–EH interval at the site, indicating that boreal conditions persisted into the EH, in contrast to geographical regions immediately south and east of the lowlands, but consistent with the Great Lakes interior lowlands. This infers that Bell Creek was at the eastern boundary of a boreal ecotone, perhaps a result of its lower elevation and the non‐analog dynamics of the Laurentide Ice Sheet. This finding suggests that the ecotone boundary extended farther east during the YD–EH transition than previously thought.