Membre des Prés Roses

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Representation and status

Color CMYK
(0%,0%,0%,100%)
Color RGB
R: 230 G: 140 B: 95
Rank
lithostratigraphic Member (Subformation)
Validity
Unit is in Use
Status
valid formal name

Nomenclature

Deutsch
Prés-Roses-Member
Français
Membre des Prés Roses
Italiano
Membro dei Prés Roses
English
Prés Roses Member
Origin of the Name

Prés Roses (JU), au sud-ouest de Delémont

Historical Variants

Près Roses Member [sic] (Pirkenseer et al. 2018)

Nomenclatorial Remarks

Correspond au «Banc à Ostrea cyathula» du bassin de Delémont, à ne pas confondre avec l'«Horizon à Ostrea cyathula» (= Membre de Therwil, nettement plus jeune) du bassin de Laufon et de la région bâloise (partie méridionale du fossé du Haut-Rhin).

Description

Thickness
0,1-2 m le long de la Sorne (Liniger 1925, Weidmann 1990)

Hierarchy and sequence

Superordinate unit

Geography

Geographical extent
Unité restreinte au bassin de Delémont.
Type area
Bassin de Delémont (JU)

Palaenography and tectonic

  • UMM-J
Tectonic unit (resp. main category)
Kind of protolith
  • sedimentary

References

Definition
Pirkenseer Claudius, Rauber Gaëtan, Roussé Stéphane (2018) : A revised Palaeogene lithostratigraphic framework for the Northern Swiss Jura and the Southern Upper Rhine Graben and its relationship to the North Alpine Foreland Basin. Riv. Italiana Pal. Strat. 124/1, 163–246

p.192: A bed of densely packed complete or fragmented oyster shells within a sandy to marly matrix, ranging in thickness from 0.1 to 2 m (Sorne section, Liniger 1925; Weidmann 1990). It is interpreted as a lateral lagoonal member of the Lörrach Fm restricted to the Delémont subbasin. Thickness varies considerably in the area of deposition. The member transgresses bioerosively either directly on the underlying Rossemaison Fm (HRT-F8/9, 19.22 to 19.14 m / 22.85 to 22.25 m; COM-F5, 65.0 to 61.4 m), or is intercalated in the proximal extension of the Pulversheim (Près Roses, Sorne river) or Lörrach Fm (ridge near Develier; Liniger 1925).

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