Using existing and new seismic reflection data, correlations of late Oligocene-early Miocene stratigraphy were made between the southern parts of Ross Sea basins. These interpretations suggest late Oligocene-early Miocene RSS-2 strata can be correlated between basins, and major problems with earlier correlations were limited to southern Victoria Land Basin in the southwest corner of Ross Sea. Previous work documented Cretaceous extension across much of Ross Sea. We interpret that Cenozoic extension also occurred throughout central and western Ross Sea, and subsidence during and following this extension deepened existing basins, and may have initiated basins in the west. Ridges between basins locally subsided below sea level during late Oligocene time. The thickness of little-deformed pre-Oligocene strata reflects Late Cretaceous cessation of major extension in easternmost Ross Sea. Successively younger Cenozoic extension occurred from east to west across the rest of Ross Sea.