Seafloor spreading at the Adare spreading axis, lasting from the Middle Eocene until the Late Oligocene (43 – 26 Ma), constrains the motion between East and West Antarctica throughout that period of time. Subsequent faulting in the Adare and Northern Basins from Late Oligocene until present-day (26 - 0 Ma) is poorly resolved and might provide a key constraint on the motion between the two plates. Here we present preliminary results of new seismic reflection and seafloor mapping data acquired on geophysical cruise 07-01 aboard the R/VIB Nathaniel Palmer. Our results suggest that the style of deformation has changed from spreading-related faulting into a diffuse normal faulting (tilted blocks) that trend NE-SW with little resultant E-W extension. Recent volcanic activity is distributed throughout but tends to align with the NE-SW trend. Formation of the Terror Rift within the same time frame suggests that the pole of rotation might have drifted northward.