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Biostratigraphic subdivision and correlation of upper Maastrichtian sediments from the Atlantic Coastal Plain and Blake Nose, western Atlantic

By
Jean M. Self-Trail
Jean M. Self-Trail
Department of Geosciences, University of Nebraska, Lincoln, NE 68508-0340,USA (jstrail@usgs.gov)
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Published:
January 01, 2001

Abstract

Detailed biostratigraphic analyses of nine cores from the Atlantic Coastal Plain and two cores from the Blake Nose, western Atlantic Ocean, provide the basis for subdivision and correlation of upper Maastrichtian sediments along a shallow- to deep-water transect. The calcareous nannofossil record from these sites shows distinct differences between the middle to outer neritic Coastal Plain sediments and the lower to upper bathyal Blake Nose sediments. Micula murus, a reliable marker species for low- to mid-latitude sites, is shown herein to respond to differing palaeoenvironmental conditions of nearshore v. open-ocean sites. Its usefulness as a biostratigraphic marker for neritic sediments is called into question. The last appearance datum of Ceratolithoides kamptneri is documented as a reliable biozone marker for latest Maastrichtian time (within CC26b) in this region. The evolutionary radiation and resulting biostratigraphic utility of species of Ceratolithoides, Lithraphidites and Micula is discussed in detail, and their first and last occurrences are tied to magneto-stratigraphic chrons where possible. Ceratolithoides amplector, Ceratolithoides indiensis and Ceratolithoides pricei are shown to be useful, biostratigraphically, in sediments deposited under bathyal conditions. Several species of Lithraphidites (Lithraphidites? charactozorro, Lithraphidites kennethii and Lithraphidites grossopectinatus) can be used to further subdivide upper Maastrichtian sediments at both neritic and bathyal localities. The first and last occurrence of Micula praemurus in Zones CC25a and CC26a, respectively, are shown to be useful biostratigraphic datum points.

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Contents

Geological Society, London, Special Publications

Western North Atlantic Palaeogene and Cretaceous Palaeoceanography

Dick Kroon
Dick Kroon
University of Edinburgh, UK
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R. D. Norris
R. D. Norris
Woods Hole OI, USA
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A. Klaus
A. Klaus
Ocean Drilling Program, USA
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Geological Society of London
Volume
183
ISBN electronic:
9781862394315
Publication date:
January 01, 2001

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