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The dating of events older than 50 ka, the limit of the radiocarbon method, has been a major drawback in assessing the chronology of the Quaternary. Several new methods have been applied to the dating of pre-late Wisconsinan organic beds in Nova Scotia. These methods include U/Th disequilibrium dating of wood and shells, 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 geologic evidence, in establishing a chronology.

Evidence of the penultimate interglacial (marine isotopic stage 7) has been found...

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