Abstract
The Agulhas Ridge Moat is a scoured depression up to 100 m deep and over 20 km wide flanking the northern side of the Agulhas Ridge in the southeastern Atlantic. A core from the moat has been assigned a late Oligocene age (Zone NP 24) based on the nannoplankton present. Scouring was probably caused by westward-flowing Antarctic Bottom Water, moving in excess of 15–20 cm s −1, possibly during the middle to late Pleistocene. Oxygen-isotope analyses indicate a late Oligocene surface-water temperature between 6.9 and 16.6°C over the core site. These paleotemperatures suggest that the Subantarctic Surface Water mass extended farther north during the Oligocene. Modern sea-surface temperatures over the site are about 21°C.
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