Late Cretaceous extinction patterns in Antarctica

• Published in: Journal of the Geological Society
• Main Authors: Crame, J.A., Lomas, S.A., Pirrie, D., Luther, A.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Geological Society of London 1996
• Subjects: Antarc*; Antarctica; Antarctica Journal
• Online Access: http://nora.nerc.ac.uk/id/eprint/515009/; https://doi.org/10.1144/gsjgs.153.4.0503

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.