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The Vöhrum section (northwest Germany) and the Aptian/Albian boundary

The Vöhrum section (northwest Germany) and the Aptian/Albian boundary

Mutterlose, J., Bornemann, A., Luppold, F.W., Owen, H.g., Ruffell, A., Weiss, W. and Wray, D. ORCID: 0000-0002-0799-2730 (2003) The Vöhrum section (northwest Germany) and the Aptian/Albian boundary. Cretaceous Research, 24 (3). pp. 203-252. ISSN 0195-6671 (doi:10.1016/S0195-6671(03)00043-0)

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Abstract

Prior to 1947, the Aptian/Albian boundary was placed at the base of the Nolaniceras nolani ammonite Zone. From (Trav. Lab. Geol. Fac. Sci. 26 (1947) 17), until (Cret. Res. 20 (1999) 609), the base of the Albian stage has been taken at the first appearance of the ammonite Leymeriella (Proleymeriella) schrammeni, a species known only from a limited area of northwest Germany. The early succession of Leymeriella and its relationship with ammonite taxa from the underlying Hypacanthoplites jacobi ammonite Zone can only be determined in the northwest German sections, all of which are ephemeral clay pits. Thus, the definition of the base of the Albian on these criteria cannot be used in a global context. The positioning of the boundary has been the subject of intense discussion in the last years. After the second International Symposium on Cretaceous Stage Boundaries in 1995 (Bull. Inst. R. Sci. Nat. Belgique, Sci. Terre 66 (1996) 45). (Cret. Res. 20 (1999) 609) lowered the boundary to the base of his Hypacanthoplites rubricosus ammonite Subzone without describing a global boundary stratotype section. (Cret. Res. 21 (2000) 591) raised the boundary to the alleged first occurrence (FO) of Leymeriella tardefurcata in a permanent section, but neither proposals can be accepted globally (Cret. Res. 23 (2002) 1). (Cret. Res. 22 (2001) 677) supported by (Cret. Res. 23 (2002) 1), suggested a radical solution by raising the boundary to the base of the geographically widespread Lyelliceras lyelli ammonite Subzone, currently the base of the Middle Albian.

In order to document accurately the classical northwest German succession of the Aptian/Albian boundary, a detailed multidisciplinary study has been made of a new section at Vohrum (clay pit no. 4) with respect to its content of calcareous nannofossils, benthic foraminifera, planktonic foraminifera, ostracods, ammonites, as well as its clay mineralogy, gamma ray signature and tuff geochemistry. The ammonite succession, in particular the Callizoniceras-Leymeriella lineage, is discussed in detail. The FO of Leymeriella (Proleymeriella) schrammeni anterior, 0.65 m below a tuff horizon near the base of the section is taken as the Aptian/Albian boundary in the classical German sense. Sections in France are discussed and the Leymeriella lineage is reviewed.

Item Type: Article
Uncontrolled Keywords: cretaceous, Aptian/Albian boundary, northwest Germany, boundary stratotype, calcareous nannofossils, benthic foraminifera, ostracods, ammonites, clay mineralogy, gamma ray, tuff geochemistry
Subjects: Q Science > QE Geology
Pre-2014 Departments: School of Science
Related URLs:
Last Modified: 14 Oct 2016 09:11
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/4312

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