Neotectonic and Glacial History of the Southweste rn Ross Sea, Anta rct ica : Enhanced Interpretation from Integrated Seafloor Bathymetry and Terrestrial DEMs Terror rift map from Storti et al 2008 Terry Wilson, Jamey Stutz, William Magee, Christopher Gordon, and Stuart Henrys The Byrd Polar Research Center at The Ohio State University GNS Science, Lower Hutt, New Zealand Terror Rift 180 Western Ross Sea, Transantarctic Antarctica Mountains Multibeam Track lines East MGDS-Lamont Ant. Ross GeoMapApp Ice Sea Sheet McMurdo Ross Ice Shelf RVIB Nathaniel B. Palmer McMurdo Sound Ross Ice Shelf 7000 km multibeam / 2500 km seismic/ dredging Wilson, Lawver & Henrys, 2004 Seafloor Volcanic Volcanic hills field ftfeatures Franklin Island Beaufort Island Aeromagnetic anomaly map: Chiappini et al. 2002 Seafloor Hills N S N C.I. = 20m Conduits underlying the hills are fault controlled – following Terror Rift structure N IT90A-65 USGS-407 Drygalski ice tongue Seafloor Franklin hills D Island D D Cape Bird, Ross Island Franklin Island seafloor hills USGS-407 Cones - Franklin Volcanic Field 556 Ka 509 Ka 90 Ka Rilling et al., 2009 surface cones USGS 407 Regional Volcanic Trends seafloor Fraasnklin Is. hills ? Mt Terror Mt Bird Mt Erebus Beaufort Is. Ross Island Regional arrays of volcanic lineaments on seafloor McMurdo Sound Bird Ross Island Dry Valleys Erebus Terror Mt Erebus Mt Bird Flat-topped mounds Erebus-related volcanic fissures McMurdo Sound: grounded ice features – marggyins only! McMurdo Ice Shelf Mt Erebus Mt Bird LGM Ross Ice Sheet Dry reconstruction Valleys McMurdo Sound Ross Island Denton & Marchant 2000 Channel systems in McMurdo Sound McMurdo Ice Shelf Mt Erebus Mt Bird Ferrar Taylor MacKay Glacier Valley Glacier “Dry ”? Va lleys.. McMurdo Ice Shelf Mapping ice limits Terrestrial mapping Denton and Marchant, 2000 Ice volume calculations: modeling GPS -derived vertical motions from glacial isostatic adjustment DtDenton an d MhtMarchant, 2000 Grounded ice limit – seafloor mapping Host of geological targets in the Ross Sea More data !.