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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 and Pavia, Giulio and Erba, Elisabetta and Guiomar, Myette and Henriques, María Helena Paiva and Lanza, Roberto and Mangold, Charles and Olivero, Davide and 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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Official URL: http://www.springer.com/birkhauser/geo+science/journal/15



Abstract

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.


Item Type:Article
Uncontrolled Keywords:Bathonian GSSP, Chronostratigraphy, Biostratigraphy, Geochronology, Ammonoidea, Calcareous nannofossils
Subjects:Sciences > Geology > Paleontology
ID Code:23929
Deposited On:16 Dec 2013 13:22
Last Modified:11 Dec 2018 08:42

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