Neogene glacigenic debris flows on James Ross Island, northern Antarctic Peninsula, and their implications for regional climate history

Fossil proxies of near-shore sea surface temperatures and seasonality from the late Neogene Antarctic shelf

“…Our fossil samples show no adhering terrigenous matrix nor are they abraded, which suggest that reworking from older deposits is probably minor or absent (Nelson et al 2009). Thus, the range of ages for bivalve molluscs collected from the same layer may indicate that the primary marine Sr/ Sr ratios have been modified, perhaps by freshwater flux with a different strontium signal during summer ice proximal melting at the time the bivalves were living (see Huang et al 2011 for evidence of Sr/ Sr variations due to freshwater input).…”

“…On James Ross Island, late Neogene marine fauna have been recovered from both iceproximal debris flow deposits and diamicts (Nelson et al 2009). Fossiliferous glacigenic debris flow deposits at Blancmange Hill, signifying episodes of ice expansion within a relatively warm period, mainly accumulated along the margins of expanding ice masses (Nelson et al 2009; Table 3).…”

“…Fossiliferous glacigenic debris flow deposits at Blancmange Hill, signifying episodes of ice expansion within a relatively warm period, mainly accumulated along the margins of expanding ice masses (Nelson et al 2009; Table 3). Austrochlamys bivalves appear to have been living on the shelf at the time of this ice expansion, and articulated specimens are included in the debris flow deposits at Blancmange Hill (Fig 6), suggesting minimal transport.…”

Late Cenozoic Foraminifera from Diamictites of Cape Lamb, Vega Island, Antarctic Peninsula

“…Among the main contributions are those carried out by harwood (1986), Gaździcki and Webb (1996), Dingle et al(1997), Gaździcki et al (2004), Ivany et al (2006Ivany et al ( ), smellie et al (2006 and hambrey and smellie (2006). Concheyro et al (2007) summarized the known information for these deposits; later, hambrey et al (2008), smellie et al (2008), Nelson et al (2009Nelson et al ( ), smellie et al (2009Nelson et al ( ), marenssi et al (2010, Nývlt et al (2011) andsalzmann et al (2011) analysed in detail the distribution of the diamictites and their genesis.…”

Sea ice extent and seasonality for the Early Pliocene northern Weddell Sea

“…Ice-proximal glaciomarine debris flows on James Ross Island incorporated 444 well-preserved bivalves and bryozoans, suggesting that ice expansion occurred under warm 445 conditions during the Pliocene, probably towards glacial inception (Nelson et al, 2009). The 446 presence of bivalves in close proximity to the palaeo-coastline supports the hypothesis of a lack of 447 sea ice, despite the presence of advancing terrestrial-based ice on James Ross Island and the 448 Antarctic Peninsula.…”