English: The ratio of calcium versus strontium (Ca/Sr) from a marine North Atlantic drill site (IODP U1308), that serves as a proxy for the mineralogically-distinctive "detrital carbonate" that characterizes Heinrich events is shown in blue (Hodell et al., 2008). Shown in red are petrologic counts of detrital carbonate over the last three glaciations (Bond et al., 1999; Obrochta et al., 2012, Obrochta et al., 2014) confirms that Ca/Sr is an indicator of Heinrich events.
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