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Formal proposal for the Bathonian GSSP (Middle Jurassic) in the Ravin du Bès Section (Bas-Auran, SE France)

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Fernández López, Sixto Rafael y Pavia, Giulio y Erba, Elisabetta y Guiomar, Myette y Henriques, María Helena Paiva y Lanza, Roberto y Mangold, Charles y Olivero, Davide y Tiraboschi, Daniele (2009) Formal proposal for the Bathonian GSSP (Middle Jurassic) in the Ravin du Bès Section (Bas-Auran, SE France). Swiss Journal of Geosciences, 102 . pp. 271-295. ISSN 1661-8726

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URL Oficial: http://www.springer.com/birkhauser/geo+science/journal/15



Resumen

The Bathonian Global Stratotype Section and Point (GSSP) is proposed at
the base of limestone bed RB071 (bed 23 in Sturani 1967) in the Ravin du
Bès Section (43º 57' 38" N, 6º 18' 55" E), Bas-Auran area, “Alpes de Haute
Provence” French department. The Ravin du Bès Section, as formal candidate
GSSP for the base of the Bathonian Stage, satisfies most of the requirements
recommended by the International Commission on Stratigraphy: 1) The exposure
extends over 13 m in thickness. At the Bajocian-Bathonian transition,
no vertical (bio-, ichno- or tapho-) facies changes, condensation, stratigraphic
gaps or hiatuses have been recorded. Structural complexity, synsedimentary
and tectonic disturbances, or important alterations by metamorphism are not
relevant constraints. 2) There is a well-preserved, abundant and diverse fossil
record across the boundary interval, with key markers (ammonites and
nannofossils) for worldwide correlation. The base of the Bathonian Stage
and Zigzag Zone in Bas-Auran corresponds to the first occurrence level of
Gonolkites convergens Buckman, which coincides with the first occurrence of
Morphoceras parvum Wetzel. Calcareous nannofossils, as secondary global
marker, are present in all beds and allow characterizing the Bajocian-Bathonian
transition. 3) Regional analyses of sequence stratigraphy and manganese
chemostratigraphy are available. Spectral gamma-ray data corroborate an
Early Bathonian deepening half-cycle of second order. 4) The criteria of accessibility,
conservation and protection are assured by the “Réserve Naturelle
Géologique de Haute Provence”. The Cabo Mondego Section (Portugal) is
suggested as the Bathonian auxiliary section and point (ASSP) within this
GSSP proposal.


Tipo de documento:Artículo
Palabras clave:Bathonian GSSP, Chronostratigraphy, Biostratigraphy, Geochronology, Ammonoidea, Calcareous nannofossils
Materias:Ciencias > Geología > Paleontología
Código ID:23929
Depositado:16 Dic 2013 13:22
Última Modificación:11 Dic 2018 08:42

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