Formation de Rossemaison

Rappresentazione e statuto

Varianti storiche: Terre jaune = Gelberde auct., Rossemaison Formation (Pirkenseer et al. 2018)

Unità di rango inferiore

Unità sovrastante

Limite superiore: contact net avec les marnes gris foncé ou une lumachelle à huîtres et riche en quartz du Groupe de Froidefontaine
Limite inferiore: Sidérolithique: passage graduel, avec matériel remanié

Geomorfologia

Età alla base

Metodo di datazione: Micromammifères de la zone MP20 et charophytes de la zone MP21 (Gander 2013, Pirkenseer et al. 2018, Mojon et al. 2018).

Estensione geografica: Dépôts restreints à la partie centrale du Bassin de Delémont.
Regione-tipo: Bassin de Delémont (JU)

Sezione-tipo

Sezione di riferimento

Termini generici

Tipo di origine

Definizione: 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.177: Generally yellow to red marls with variable sand content and reworked Sidérolithique components that are limited to the central Delémont subbasin (Liniger 1925). Locally evaporites (gypsum), lacustrine limestones (“Raiche, Raitsche”) and conglomerates are intercalated (e.g. Rollier 1910), thus hinting at a fluvio-lacustrine, probably endorheic environment. The Rossemaison Fm has been historically (mining) subdivided in four units (see Liniger 1925), which however cannot be followed throughout the subbasin.

The Rossemaison Fm pinches out towards the southern basin margin, with a variable maximum thickness of 70 m (drilling COM-F5; 128.0 to 65.0 m, Fig. 10) to more than 140 m near Delémont (abandoned mine Près Grebis; Liniger 1925). At the subbasin margin the thickness ranges between 10 m (Châtillon; Gander 2013) and 4-5 m (drilling HRT-F8; 21.9 to 19.2 m, Fig. 12).

Pubblicazioni importanti: Liniger H. (1925) : Geologie des Delsberger Beckens und der Umgebung von Movelier. Beitr. Geol. Karte Schweiz (N.F.) 55/4, 82 Seiten