Banc du Ponthoud
Back to JuraRepresentation and status
- Color RGB
- R: 245 G: 170 B: 170
- Rank
- lithostratigraphic Bed
- Validity
- Unit is in Use
- Status
- informal term
Nomenclature
- Deutsch
- Ponthoud-Bank
- Français
- Banc du Ponthoud
- Italiano
- Strato del Ponthoud
- English
- Ponthoud Bed
- Origin of the Name
-
Le Ponthoud, quartier du SW de Bellegarde-sur-Valserine (France), juste en aval du viaduc autoroutier.
- Historical Variants
-
Ponthoud Bed (Pictet et al. 2016)
Description
- Thickness
- Max. 60 cm dans la région de Bellegarde-sur-Valserine.
Hierarchy and sequence
- Superordinate unit
- Units at roof
- Units at floor
Age
- Age at top
-
- Late Aptian
- Note about top
-
Zone à Hoplites jacobi + L. tardefurcatum
- Age at base
-
- Late Aptian
- Note about base
-
Zone à Deshayesites nodosocostatum
- Dating Method
-
Biostratigraphie des ammonites (Pictet in prep.)
Geography
- Type area
- Jura méridional
Palaenography and tectonic
-
- Cretaceous of the Jura Mountains
- Tectonic unit (resp. main category)
-
-
Jura
:
Juragebirge
-
Jura
:
- Kind of protolith
-
- sedimentary
- Metamorphism
- non metamorphic
References
- Definition
-
(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 second one, the Ponthoud Bed (S8, Figs. 4, 8d–e), is a 1 m thick green coquina-rich limestone, which is composed by a quartz and phosphate-rich packstone (Fig. 8e). The Ponthoud Bed delivered an heterotrophic fauna with numerous sponges, bryozoans, echinids, bivalves, gastropods, brachiopods, and rare ammonites (Fig. 8f; ~6 taxa; Pictet and Renevier 1854–1858; Pictet and Campiche 1858–1871) showing a strong affinity with the fauna of Clansayes (Kilian and Leenhardt 1890; Jacob 1905; Moullade 1965).