Late Eocene signals of oncoming Icehouse conditions and changing ocean circulation, Antarctica

The end of the Eocene greenhouse world was most dramatic phase in long-term Cenozoic cooling trend. Here we use 75,000 km multi/single channel seismic reflection data from offshore Prydz Bay, Antarctica, to provide new insight on Paleogene stratigraphic transition icehouse conditions and reorganizing ocean circulation changes that were invigorated by glaciation. We identify a prominent transitional (Greenhouse Icehouse) preserved deep-water sedimentary record correlating shelf continental slope. occurrence mega-Mass Transport Deposits (MTDs) slope during an early stage suggests significant instability collapse upper part margin. A second is represented growth well-defined set clinoforms. estimate formation age MTDs clinoforms be around Eocene-Oligocene Transition. indicates sea level has risen, large volumes sediment delivered margin marine-terminating glaciers shelf. Finally, subsequent marked migration depocenter toward west northwest, attests onset drift sedimentation full glacial conditions, suggesting more vigorous as Earth entered after boundary.