Grès des Vernettes

Darstellung und Status

Farbe CMYK

Cf. Membre de Mussel

Farbe RGB

R: 245 G: 170 B: 170

Rang

lithostratigraphische Bank

Gebrauch

Element ist in Gebrauch

Status

informeller Begriff

Nomenklatur

Deutsch

Vernettes-Sandstein

Français

Grès des Vernettes

English

Vernettes Sandstone

Herkunft des Namens

Les Vernettes, quartier de Bonvy (France) situé au sud de Bellegarde-sur-Valserinne

Historische Varianten

Vernettes Beds (Pictet et al. 2016)

Beschreibung

Mächtigkeit

Max. 2 m dans la région de Bellegarde-sur-Valserine, env. 1,2 m dans la région de Ste-Croix.

Hierarchie und Abfolge

Hangendes

• Argiles de La Presta

Alter

Alter Top

• Frühes Albien

Bermerkungen zu Top

Zone à C. floridum + H. puzosiana + O. subhilli

Alter Basis

• Frühes Albien

Bermerkungen zu Basis

Zone à L. irregularis + S. kitchini

Datierungsmethode

Biostratigraphie des ammonites (Pictet in prep.)

Geografie

Typusregion

Jura méridional

Referenzen

Erstdefinition

Pictet Antoine, Delamette Michel, Matrion Bertrand (2016) : The Perte-du-Rhône Formation, a new Cretaceous (Aptian-Cenomanian) lithostratigraphic unit in the Jura mountains (France and Switzerland). Swiss J. Geosc. 109/2, 221-240

From the base to the top of the Mussel Mb, five subunits have been identified (Fig. 8).

The third one, the Vernettes Beds (unit S9, Figs. 4, 8g–h), is a 0–10 m thick light green, white or orange, lightly marly sandstone. The microfacies is a glauconite and quartz-rich packstone (Fig. 8h). The Vernettes Beds includes a basal white phosphatic conglomerate, which delivered a rich benthic (echinids, bivalves, gastropods, brachiopods) and an abundant nectonic macrofauna (belemnites, and about 11 ammonites taxa, Fig. 8i, Pictet and Roux 1847–1854, Pictet and Campiche 1858–1871, Renz and Jung 1978). The ammonite fauna from these beds records the Aptian-Albian boundary and presents some unusual taxa. This fauna will be the subject of a future detailed palaeontological study.

Material und Varia