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- W2256173772 abstract "Dating events older than S0,000 years B.P., the limit of the radiocarbon method, has been a major drawback in assessing the chronology of the Quaternary. Recently several new methods have been applied to the dating of buried forest and sea beds exposed in the province. These methods include U{fh disequilibrium dating of wood, amino acid racemization dating of shells and wood and electron spin resonance dating of shells. These methods are not without problems, and must be assessed together and in concert with geological evidence in establishing a chronology. Using this approach a new chronology has emerged. Deposits of the penultimate interglacial (marine isotopic stage 7) have been found in southern Nova Scotia. The last interglacial has been subdivided into three units corresponding to marine isotope stages Sa, Sc and Se. Mid-Wisconsinan (()(),00030,000 years B.P.) radiocarbon and U{Thdateson some of the forest beds have pushed up the limit of this non-glacial interval but the validity of these dates are suspect. Many new dates have been obtained from the interval 14,000 10,000 years B.P. Evidence for change from wanner to cold climate around I I ,000 has been established by dating pollen transition zones in lakes and buried organic beds. This fluctuation correlates with the Younger Dryas-Allerod oscillation of Europe. Rapid climate change is indicated by synchronous glacial buildup and advances." @default.
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- W2256173772 date "1990-01-01" @default.
- W2256173772 modified "2023-09-24" @default.
- W2256173772 title "Abstract: New Quaternary age dates in Atlantic Canada" @default.
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