On the left, oxygen isotope ratios in the GISP2 ice core from Summit, Greenland. Middle, an index of bioturbation in a sediment core from the Santa Barbara basin off the California coast, ranging from one -- distinct, continuous laminations with no bioturbation, to four -- completely bioturbated, fine-grained sediment, presented as a 49-centimeter running average. Right, oxygen isotope ratios in benthic (deep-water) foraminifera in the Santa Barbara core. The ice-core and marine chronologies were derived independently. At least 16 of the 17 warm interstadials in the Greenland ice core can be clearly seen in laminated sections of the Santa Barbara core.
Source: Richard J. Behl and James P. Kennett, "Brief Interstadial Events in the Santa Barbara Basin, NE Pacific, During the Past 60 kyr," Nature Vol. 379 (Jan. 18, 1996), p. 244.
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Last modified by pib on October 28, 2003.