作者: Grahame J. Larson
DOI: 10.1016/B978-0-444-53447-7.00037-4
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摘要: During retreat of the last ice sheet from Michigan four major readvances occurred with each terminating at a position short previous readvance. Radiocarbon dates indicate they culminated ~15.0, ~13.0, ~11.7 and ~10.0 14C ka BP. Only third forth are constrained by age in situ organic material.