Oceanography The Official Magazine of
The Oceanography Society
Volume 25 Issue 03

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Volume 25, No. 3
Pages 82 - 83


SIDEBAR • SHALDRIL I and II: Drilling from the Research Vessel Icebreaker Nathaniel B. Palmer

John B. Anderson Julia S. Wellner
First Paragraph

Understanding of Antarctica’s climate and ice sheet evolution remains fragmented due to a paucity of outcrops and drill cores that contain deposits from the Neogene (~ 23–2.6 million years ago), when major environmental changes were occurring. Sea ice and icebergs hinder sampling from conventional drill ships, limiting recovery of continental margin strata that bear the most direct record of glaciation on the Antarctic Continent. Because the continental shelf has been deeply eroded by ice sheets, older strata typically lie within a few meters to tens of meters below the seafloor. In most cases, these strata are buried beneath till and glacimarine sediments that, even though thin, prevent sampling by conventional coring methods.


Anderson, J.B., and J.S. Wellner. 2012. SHALDRIL I and II: Drilling from the Research Vessel Icebreaker Nathaniel B. Palmer. Oceanography 25(3):82–83, https://doi.org/10.5670/oceanog.2012.78.


Anderson, J.B., S. Warny, R.A. Askin, J.S. Wellner, S.M. Bohaty, A.E. Kirshner, D.N. Livsey, A.R. Simms, T.R. Smith, W. Ehrmann, and others. 2011. Progressive Cenozoic cooling and the demise of Antarctica’s last refugium. Proceedings of the National Academy of Sciences of the United States of America 108:11,356–11,360, https://doi.org/10.1073/pnas.1014885108.

Anderson, J.B., and J.S. Wellner, eds. 2011. Tectonic, Climatic, and Cryospheric Evolution of the Antarctic Peninsula. American Geophysical Union, Washington, DC, 218 pp.
Kennett, J.P. 1977. Cenozoic evolution of Antarctic glaciation, the circum-Antarctic Ocean, and their impact on global paleoceanography. Journal of Geophysical Research 82:3,843– 3,860, https://doi.org/10.1029/JC082i027p03843.

Michalchuk, B., J.B. Anderson, J. Wellner, P. Manley, W. Majewski, and S. Bohaty. 2009. Holocene climate and glacial history of the northeastern Antarctic Peninsula: The marine sedimentary record from a long SHALDRIL core. Quaternary Science Reviews 28:3,049–3,065, https://doi.org/10.1016/j.quascirev.2009.08.012.

Milliken, K.T., J.B. Anderson, J.S. Wellner, S.M. Bohaty, and P.L. Manley. 2009. High-resolution Holocene climate record from Maxwell Bay, South Shetland Islands, Antarctica. Geological Society of America Bulletin 121:1,711–1,725, https://doi.org/10.1130/B26478.1.

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