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Journal of the Geological Society; 1996; v. 153; issue.4; p. 503-506;
DOI: 10.1144/gsjgs.153.4.0503
© 1996 Geological Society of London

Article

Late Cretaceous extinction patterns in Antarctica

J. A. CRAME1, S. A. LOMAS1, D. PIRRIE2 & A. LUTHER3

1 British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 OET, UK
2 Camborne School of Mines, University of Exeter, Redruth, Cornwall TR15 3SE, UK
3 Geologisch-Paläontologisches Institut, Universität Heidelberg, Im Neuenheimer Feld 234, D-69120, Heidelberg, Germany

New correlations of marine clastic sedimentary rocks exposed within the James Ross Basin, Antarctica have shown that the mid-to late Cretaceous succession is in excess of 5 km thick. Plotting the ranges of the principal molluscan macrofossils against the revised stratigaphy indicates that inoceramid bivalves are totally absent, and dimitobelid belemnites extremely rare, throughout an extensive 1400 m thick Maastrichtian succession. These early extinction patterns are interpreted to be due to both a regional shallowing event and a pronounced phase of high-latitude, Campanian–Maastrichtian cooling. Cool polar bottom waters may have been forming by as early as mid- to late Campanian times.


Keywords: Antarctica, K–T boundary, Inoceramidae, belemnites, extinction.




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