18Oc measured in foraminifera collected from deep sea sediment cores (Lisiecki et al., 2005). (sciencedaily.com)
But the latest research into sulphur - producing algae, ancient ice cores, and sea sediments from the North Atlantic region could help climatologists (newscientist.com)
In previous studies, the scientists had found evidence of eight massive melting events in deep sea sediments around the Antarctic, which occurred at the transition from the last ice age to the present warm period. (sciencedaily.com)