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Bart, Philip J (2003): Middle Miocene events in ODP and DSDP sites of the Ross Sea. PANGAEA,, Supplement to: Bart, PJ (2003): Were West Antarctic Ice Sheet grounding events in the Ross Sea a consequence of East Antarctic Ice Sheet expansion during the middle Miocene? Earth and Planetary Science Letters, 216(1-2), 93-107,

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Seismic correlation of glacial unconformities from the Ross Sea outer continental shelf to chronostratigraphic control at DSDP sites 272 and 273 indicates that at least two West Antarctic Ice Sheet (WAIS) expansions occurred during the early part of the middle Miocene (i.e. well before completion of continental-scale expansion of the East Antarctic Ice Sheet (EAIS) inferred from delta18O and eustatic shifts). Therefore, if the volume of the EAIS was indeed relatively low, and if the Ross Sea age model is valid, then these WAIS expansions/contractions were not a direct consequence of EAIS expansion over the Transantarctic Mountains onto West Antarctica. An in-situ development of the WAIS during the middle Miocene suggests that either West Antarctic land elevations were above sea level and/or that air and water temperatures were sufficiently cold to support a marine-based ice sheet. Additional chronostratigraphic and lithologic data are needed from Antarctic margins to test these speculations.
Median Latitude: -65.321800 * Median Longitude: 127.863500 * South-bound Latitude: -77.127000 * West-bound Longitude: 76.794000 * North-bound Latitude: -54.811000 * East-bound Longitude: -176.760200
Date/Time Start: 1973-02-06T00:00:00 * Date/Time End: 1988-03-12T00:00:00
120-747 * Latitude: -54.811000 * Longitude: 76.794000 * Date/Time Start: 1988-03-06T00:00:00 * Date/Time End: 1988-03-12T00:00:00 * Elevation: -1706.7 m * Penetration: 656.8 m * Recovery: 325.8 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg120 * Basis: Joides Resolution * Device: Composite Core (COMPCORE) * Comment: 49 cores; 450.8 m cored; 0 m drilled; 72.3% recovery
28-272 * Latitude: -77.127000 * Longitude: -176.760200 * Date/Time: 1973-02-06T00:00:00 * Elevation: -619.0 m * Penetration: 443 m * Recovery: 147.8 m * Location: Antarctic Ocean * Campaign: Leg28 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 35 cores; 332.5 m cored; 68.5 m drilled; 44.5 % recovery
28-273_Site * Latitude: -74.538200 * Longitude: 174.626200 * Date/Time: 1973-02-10T00:00:00 * Elevation: -491.0 m * Penetration: 4.235 m * Recovery: 0.834 m * Location: Antarctic Ocean * Campaign: Leg28 * Basis: Glomar Challenger * Device: Composite Core (COMPCORE) * Comment: 33 cores; 286 m cored; 47.5 m drilled; 29.2% recovery
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Datasets listed in this publication series

  1. Bart, PJ (2003): (Table 1) Two-way time, age and corrected ages of middle Miocene at DSDP sites 28-272 and 28-273.
  2. Bart, PJ (2003): (Table 2) Miocene events at ODP Site 120-747.