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Israde-Alcántara et al. (1) drew on interpretations of a core from Lake Cuitzeo, Mexico to support the Younger Dryas (YD) Impact Hypothesis. A key aspect of their study was identifying and dating the YD interval in the sediments. The authors stated that they recovered impact indicators from a 10-cm-thick zone dating to 12.9 kcal BP but provided no direct numerical age control or chronological uncertainties for this interval. Depending on the carbon sources, 14C ages of bulk lake sediment can be offset by several centuries (2). However, even though the study used bulk 14C dates, no offset was quantified. Dating of the section was accomplished by …

Age models and the Younger Dryas Impact Hypothesis