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Publication Type
Journal Article
UWI Author(s)
Author, Analytic
Mitchell, Simon F
Author Affiliation, Ana.
Department of Geography and Geology
Article Title
Eight belemnite biohorizons in the Cenomanian of northwest Europe and their importance
Medium Designator
n/a
Connective Phrase
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Journal Title
Geological Journal
Translated Title
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Reprint Status
n/a
Date of Publication
2005
Volume ID
40
Issue ID
n/a
Page(s)
363-382
Language
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Connective Phrase
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Location/URL
http:; www3.interscience.wiley.com/cgi-bin/abstract/110541516/ABSTRACT
ISSN
n/a
Notes
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Abstract
Eight belemnite biohorizons (BB) are recognized in the Cenomanian of northwest Europe, and can be related to both the ammonite zonal/subzonal and Cenomanian cyclostratigraphic schemes. These biohorizons are: BB1 (Neohibolites praeultimus) in the basal Neostlingoceras carcitanense Subzone (Mantelliceras mantelli Zone); BB2 (Neohibolites ultimus) in the upper N. carcitanense Subzone (M. mantelli Zone); BB3 (N. ultimus) in the Sharpeiceras schluteri Subzone (M. mantelli Zone); BB4 (N. ultimus) at the base of the Mantelliceras dixoni Zone; BB5 (N. ultimus) in the Cunningtoniceras inerme Zone; BB6 (Praeactinocamax primus and Belemnocamax boweri) in the lower Acanthoceras rhotomagense Zone; BB7 (B. boweri) in the middle A. jukesbrownei Zone; and BB8 (P. plenus) in the mid Metoicoceras geslinianum Zone. Belemnites are associated with deposits overlying the transgressive surfaces in the early transgressive systems tracts (BB2-4, BB6-8) or, rarely, with higher-frequency transgressive surfaces in lowstand deposits (BB5). Early transgressive systems tracts also commonly have small positive 1318C excursions, although there is no one-to-one correspondence between the excursions and the belemnite biohorizons. A review of 18O curves for the Cenomanian Stage suggests little evidence for a temperature control on the distribution of belemnite....
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