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Journal of the Geological Society; 1998; v. 155; issue.5; p. 737-740;
DOI: 10.1144/gsjgs.155.5.0737
© 1998 Geological Society of London

SPECIAL

A reassessment of the age of the Cockburn Island Formation, northern Antarctic Peninsula, and its palaeoclimatic implications

H. A. JONKERS1 & S. P. KELLEY2

1 British Antarctic Survey, Natural Environment ResearchCouncil, High Cross, Madingley Road, CambridgeCB3 0ET, UK (e-mail: H.A.Jonkers{at}bas.ac.uk)
2 Department of Earth Sciences, The Open University,Milton Keynes MK7 6AA, UK

New constraints on the age of the Cockburn Island Formation, northern Antarctic Peninsula, resulting from whole rock laser-stepped heated 40Ar–39Ar dating of associated basalt and palaeomagnetic re-calibration of the ranges of the formation’s fossil diatom taxa, suggest that interglacial conditions existed around 3 million years ago. The refined age of the deposit supports continent-wide Late Pliocene warming in Antarctica, and makes more likely the occurrence of extensive marine incursions in East Antarctica at that time.

Key Words: Antarctica • Pliocene • palaeoclimatology • 40Ar–39Ar • diatoms




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