Fig. 1. (A) Map of McMurdo Sound and the Cape Roberts region showing geographical setting and location of seismic lines and Cape Roberts drill sites. (B) Shore-normal interpreted seismic cross-section through CRP drill holes showing base of sequences, 9, 10 and 11. (C) Shore parallel interpreted seismic cross-section (NBP6901-93) showing the lateral extent of sequences 9, 10 and 11, which are of even thickness, and can be mapped over tens of kilometres north towards the McKay Sea Valley.

Fig. 2. Conceptual sequence stratigraphic and facies interpretation of the Late Oligocene, Milankovitch-duration glacimarine sequences in the CRP cores (after Fielding et al., 2000; Naish et al., 2001b).

Fig. 3. Summary stratigraphic log for sequences 9, 10 and 11 from CRP-2/2A shown particle size distributions and the percent mud. Ice proximity; n = non-glacial, d = distal, p = proximal, i = ice contact.

Fig. 4. Correlation of the late Oligocene sequences with the astronomically-tuned, benthic oxygen isotope record of ODP Site 1090 (Billups et al., 2004). The chronostratigraphy of CRP 9,10,11 is after (Naish et al., 2008-this volume). Sequences 9 and 10 correspond to 41 ka obliquity cycles, and sequence 9 to a 100 ka cycle. Cenozoic isotope curve modified from Zachos et al. (2001b).

Fig. 5. Percent mud plotted from published data (Dunbar and Barrett, 2005) for modern shoreface inner shelf settings of a number of different wave climates. Wave data from; Petone (Dunbar, unpublished); Peka Peka (Dunbar and Barrett, 2005); Monterey Bay, modified after (Xu, 1999); Bristol Bay (Sharma et al., 1972).

Fig. 6. Schematic paleogeographic and paleoglaciaological reconstructions (DeConto et al., 2007) for the Victoria Land coast line during an late Oligocene (A) glacial period and (B) interglacial period (modified from Barrett, 2007). G = Granite, B = Beacon Supergroup.

Fig. 7. Percent mud and corresponding estimated paleobathymetry envelope (shaded grey) for sequences 9, 10 and 11. The shallow curve is interpolated from the moderate energy Peka Peka profile and the deeper curve from the moderate-high energy Monterey Bay profile (Fig. 5). Values between points in each profile were obtained by linear interpolation.

Fig. 8. Glacimarine sequence stratigraphic model shows the development of facies and sequence architecture as both a function of glacial proximity and water depth change. Note relative positions of sequences 9, 10 and 11 with respect to the sequence architecture model shown in (E).