Basiszone (der OSM)

Representation and status

Color CMYK

N/A

Color RGB

R: 125 G: 125 B: 125

Rank

lithostratigraphic unit

Validity

Unit is not in Use

Status

informal term

Status discussion

Nomenclature

Deutsch

Basiszone (der OSM)

Français

Basiszone (de l'OSM)

Italiano

Basiszone (dell'OSM)

English

Basiszone (of the OSM)

Historical Variants

OSM Basiszone (Büchi 1958), "Bituminöse Mergel", Basiszone der OSM (Büchi 1960, Büchi et al. 1965, Büchi & Schlanke 1977, Naef 2015)

Description

Geomorphology

Relativ rasch verwitternd, nur mässig verfestigt.

Thickness

50-70 m im Norden, bis 500 m im Süden (Büchi 1960). Ca. 225 m in der Tiefbohrung St. Gallen (Schlancke 2015).

Hierarchy and sequence

Units at roof

• «Mittlerer Komplex» (der OSM)
• Appenzellergranit-Leitniveau

Units at floor

• Hörnli-Nagelfluh

Age

Age at top

• Langhian

Age at base

• late Burdigalian

Dating Method

Basales «Tortonien» (Büchi 1960).

Palaenography and tectonic

• OSM-I

Tectonic unit (resp. main category)

• Molasse

Kind of protolith

• sedimentary

Metamorphism

non metamorphic