Heinrich events are postulated to result from catastrophic iceberg calving; the rapid dessimination of icebergs would result in thin ice-rafted deposits throughout North Atlantic. Such events could have caused sudden global sea-level rises of several meters in amplitude and reduced the elevation of the Laurentioan Ice Sheet. As a result, the whole Northern hemisphere would have undergone drastic warming. Eventually, increased snow accumulation rates would have allowed the ice sheet to return to its earlier elevation, thus bringing about a new cold phase (Patterson et al., 1995).