Frontispiece 1. Scanning electron microscope photographs of a dry piece of sediment from a Thalassiothrix antarctica–rich interval (Sample 175-1084A-47X-2W, 70–73 cm). A. General aspect. B. Close-up view. Note the fragments of Thalassiothrix and the presence of coccoliths. C. The sea-surface temperature (SST) record derived from the Uk´₃₇ index (alkenones), diatom abundance, and opal index from Site 1084. Note the diatom maximum (DiaMax) in the frontal zone and the decrease in abundance toward the warm oceanic region.