/* DATA DESCRIPTION: Citation: Naish, Tim R; Powell, Ross; Levy, Richard H; Wilson, Gary S; Scherer, Reed P; Talarico, Franco M; Krissek, Lawrence A; Niessen, Frank; Pompilio, Massimo; Wilson, Terry; Carter, Lionel; DeConto, Robert M; Huybers, Peter; McKay, Robert M; Pollard, David; Ross, J; Winter, Diane M; Barrett, Peter J; Browne, G; Cody, Rosemary; Cowan, Ellen A; Crampton, James; Dunbar, Gavin B; Dunbar, Nelia W; Florindo, Fabio; Gebhardt, Catalina; Graham, I J; Hannah, Mike J; Hansaraj, D; Harwood, David M; Helling, D; Henrys, Stuart A; Hinnov, Linda A; Kuhn, Gerhard; Kyle, Philip R; Läufer, Andreas; Maffioli, P; Magens, Diana; Mandernack, Kevin W; McIntosh, W C; Millan, C; Morin, Roger H; Ohneiser, Christian; Paulsen, Timothy S; Persico, Davide; Raine, J Ian; Reed, J; Riesselman, Christina R; Sagnotti, Leonardo; Schmitt, Douglas R; Sjunneskog, Charlotte; Strong, P; Taviani, Marco; Vogel, Stefan; Wilch, T; Williams, Trevor (2009): (Table S1) Chronostratigraphic constrains for sediment core AND1-1B. PANGAEA, https://doi.org/10.1594/PANGAEA.769658, Supplement to: Naish, TR et al. (2009): Obliquity-paced Pliocene West Antarctic ice sheet oscillations. Nature, 458(7236), 322-329, https://doi.org/10.1038/nature07867 Abstract: Thirty years after oxygen isotope records from microfossils deposited in ocean sediments confirmed the hypothesis that variations in the Earth's orbital geometry control the ice ages (Hays et al., 1976, doi:10.1126/science.194.4270.1121), fundamental questions remain over the response of the Antarctic ice sheets to orbital cycles (Raymo and Huybers, 2008, doi:10.1038/nature06589). Furthermore, an understanding of the behaviour of the marine-based West Antarctic ice sheet (WAIS) during the 'warmer-than-present' early-Pliocene epoch (~5-3 Myr ago) is needed to better constrain the possible range of ice-sheet behaviour in the context of future global warming (Solomon et al., 2007). Here we present a marine glacial record from the upper 600 m of the AND-1B sediment core recovered from beneath the northwest part of the Ross ice shelf by the ANDRILL programme and demonstrate well-dated, ~40-kyr cyclic variations in ice-sheet extent linked to cycles in insolation influenced by changes in the Earth's axial tilt (obliquity) during the Pliocene. Our data provide direct evidence for orbitally induced oscillations in the WAIS, which periodically collapsed, resulting in a switch from grounded ice, or ice shelves, to open waters in the Ross embayment when planetary temperatures were up to ~3° C warmer than today ( Kim and Crowley, 2000, doi:10.1029/1999PA000459) and atmospheric CO2 concentration was as high as ~400 p.p.m.v. (van der Burgh et al., 1993, doi:10.1126/science.260.5115.1788, Raymo et al., 1996, doi:10.1016/0377-8398(95)00048-8). The evidence is consistent with a new ice-sheet/ice-shelf model (Pollard and DeConto, 2009, doi:10.1038/nature07809) that simulates fluctuations in Antarctic ice volume of up to +7 m in equivalent sea level associated with the loss of the WAIS and up to +3 m in equivalent sea level from the East Antarctic ice sheet, in response to ocean-induced melting paced by obliquity. During interglacial times, diatomaceous sediments indicate high surface-water productivity, minimal summer sea ice and air temperatures above freezing, suggesting an additional influence of surface melt (Huybers, 2006, doi:10.1126/science.1125249) under conditions of elevated CO2. Keyword(s): D-ANDRILL Project(s): Antarctic Geological Drilling (ANDRILL) (URI: https://en.wikipedia.org/wiki/ANDRILL) Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas (SPP1158) (URI: https://gepris.dfg.de/gepris/projekt/5472008) Funding: German Research Foundation (DFG) (URI: http://www.dfg.de/en/), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas (URI: https://gepris.dfg.de/gepris/projekt/5472008) Coverage: LATITUDE: -77.889440 * LONGITUDE: 167.089320 DATE/TIME START: 2006-10-31T00:00:00 * DATE/TIME END: 2006-12-26T00:00:00 MINIMUM DEPTH, sediment/rock: 80.03 m * MAXIMUM DEPTH, sediment/rock: 596.35 m Event(s): AND1-1B (AND-1B) * LATITUDE: -77.889440 * LONGITUDE: 167.089320 * DATE/TIME START: 2006-10-31T00:00:00 * DATE/TIME END: 2006-12-26T00:00:00 * ELEVATION: -917.0 m * Recovery: 1284.85 m * CAMPAIGN: MIS (McMurdo Ice Shelf) (URI: hdl:10013/epic.28735.d001) * BASIS: McMurdo Station (URI: https://en.wikipedia.org/wiki/McMurdo_Station) * METHOD/DEVICE: Drilling/drill rig (DRILL) * COMMENT: Drilled through shelf ice, thickness of ice ~82 m Comment: Biostratigraphic event ages include the maximum and minimum age identified in the CONOP constrained Southern Ocean diatom biochronologic calibration of Cody et al. (2008, doi:10.1016/j.palaeo.2007.08.020), except FO of Thalassiosira complicata and FO Rhizosolenia sp. D which are new (unpublished) ages determined in recent model runs (Cody et al., submitted). Parameter(s): Datum level (DL) * PI: Naish, Tim R (https://orcid.org/0000-0002-1185-9932, t.naish@gns.cri.nz) DEPTH, sediment/rock [m] (Depth sed) * GEOCODE Depth, top/min [m] (Depth top) * PI: Naish, Tim R (https://orcid.org/0000-0002-1185-9932, t.naish@gns.cri.nz) Depth, bottom/max [m] (Depth bot) * PI: Naish, Tim R (https://orcid.org/0000-0002-1185-9932, t.naish@gns.cri.nz) Method comment (Method comm) * PI: Naish, Tim R (https://orcid.org/0000-0002-1185-9932, t.naish@gns.cri.nz) Age model [ka] (Age model) * PI: Naish, Tim R (https://orcid.org/0000-0002-1185-9932, t.naish@gns.cri.nz) Age model, optional [ka] (Age model opt) * PI: Naish, Tim R (https://orcid.org/0000-0002-1185-9932, t.naish@gns.cri.nz) * COMMENT: maximum age Age, error [±] (Age e) * PI: Naish, Tim R (https://orcid.org/0000-0002-1185-9932, t.naish@gns.cri.nz) Ageprofile Datum Description (Ageprof dat des) * PI: Naish, Tim R (https://orcid.org/0000-0002-1185-9932, t.naish@gns.cri.nz) * COMMENT: FO = first occurrence, LO = last occurrence Age, comment (Comm) * PI: Naish, Tim R (https://orcid.org/0000-0002-1185-9932, t.naish@gns.cri.nz) License: Creative Commons Attribution 3.0 Unported (CC-BY-3.0) (URI: https://creativecommons.org/licenses/by/3.0/) Size: 129 data points */ DL Depth sed [m] Depth top [m] Depth bot [m] Method comm Age model [ka] Age model opt [ka] Age e [±] Ageprof dat des Comm A 80.03 paleomagnetic 781 Bruhnes-Matuyama transition based on geomagnetic polarity timescale calibrated of Ogg and Smith (2004) B 84.97 paleomagnetic 988 top Jaramillo Subchron based on geomagnetic polarity timescale calibrated of Ogg and Smith (2004) C 85.50 radiometric 1014 4 40Ar/39Ar, K-feldspar from Wilson et al. (2007) D 91.13 paleomagnetic 1072 base Jaramillo Subchron based on geomagnetic polarity timescale calibrated of Ogg and Smith (2004) E 112.51 radiometric 1650 30 40Ar/39Ar, basaltic glass from Wilson et al. (2007) F 136.21 radiometric 1670 30 40Ar/39Ar, basaltic glass from Wilson et al. (2007) G 150.73 paleomagnetic >1945 absence of Olduvai Subchron H 158.90 biostratigraphic >2010 LO of Actinocyclus fasciculata I 164.10 biostratigraphic >2210 LO of Actinocyclus maccollumii J 191.75 paleomagnetic 2581 Gauss-Matuyama transition based on geomagnetic polarity timescale calibrated of Ogg and Smith (2004) K 193.70 biostratigraphic <2790 FO of Actinocyclus fasciculata L 201.40 biostratigraphic >2870 FO of Actinocyclus maccollumii M 212.00 2870 absence of Actinocyclus fasciculata and A. maccollumii N 248.00 paleomagnetic 3032 Top Kaena Subchron based on geomagnetic polarity timescale calibrated of Ogg and Smith (2004) O 133.64 267.28 282.83 paleomagnetic 3032 3116 4 cycles within Kaena Subchron (112.8-myr-duartion) based on geomagnetic polarity timescale calibrated of Ogg and Smith (2004) P 346.13 paleomagnetic 3330 base of Mammoth Subchron based on geomagnetic polarity timescale calibrated of Ogg and Smith (2004) Q 438.61 paleomagnetic 3596 Gilbert-Gauss transition based on geomagnetic polarity timescale calibrated of Ogg and Smith (2004) R 440.12 biostratigraphic <3560 FO of Rhizosolenia sp. D S 220.06 440.12 450.00 biostratigraphic >4290 4720 absence of Fragilariopsis interfrigidaria and F. barronii T 452.86 paleomagnetic 4493 Top Nunivak Subchron based on geomagnetic polarity timescale calibrated of Ogg and Smith (2004) U 456.00 biostratigraphic <4780 FO of Thalassiosira striata V 459.19 paleomagnetic 4631 Base Nunivak Subchron based on geomagnetic polarity timescale calibrated of Ogg and Smith (2004) w 481.80 radiometric 4800 76 40Ar/39Ar, K-feldspar from Wilson et al. (2007) X 519.40 paleomagnetic 4799 Top Sidufjall Subchron based on geomagnetic polarity timescale calibrated of Ogg and Smith (2004) Y 583.64 biostratigraphic 4860 FO of Thalassiosira complicata z 596.35 paleomagnetic 4896 Base Sidufjall Subchron based on geomagnetic polarity timescale calibrated of Ogg and Smith (2004)