P. J. Barrett, D. P. Elston, D. M. Harwood, B. C. McKelvey, P.-N. Webb; Mid-Cenozoic record of glaciation and sea-level change on the margin of the Victoria Land basin, Antarctica. Geology ; 15 (7): 634–637. doi: https://doi.org/10.1130/0091-7613(1987)15<634:MROGAS>2.0.CO;2
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The MSSTS-1 drill hole in western McMurdo Sound provides the earliest physical record thus far for Antarctic Cenozoic glaciation. The hole penetrated 227 m of muddy marine glacial sediment containing scattered pebble- and cobble-size clasts, including seven diamictite beds deposited from grounded ice during glacial advances. A diatom-based chronology, refined by paleomagnetic stratigraphy, for the interval below 116-m subbottom indicates sediment accumulation from 29 Ma to about 24 Ma. Sediment texture and paleoecology of diatoms and foraminifers indicate nearshore sedimentation on a wave-dominated shelf. The oldest strata record a significant shallowing of water depth, culminating in ice grounding at around 28 Ma and a deepening at 25 Ma that may be glacioeustatic.