«Calcaire âpre»

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Representation and status

Color CMYK
(21%,0%,12%,18%)
Color RGB
R: 165 G: 210 B: 185
Rank
petrographic facies
Validity
Unit is not in Use
Status
local name (informal)

Nomenclature

Deutsch
«Calcaire âpre»
Français
«Calcaire âpre»
Italiano
«Calcaire âpre»
English
«Calcaire âpre»
Origin of the Name

âpre: rugueux, râpeux, dont la surface est inégale

Historical Variants

calcaire âpre (Jaccard 1869, Ryniker 1923, Frei 1925, Rameil 2005), cell dolomite

Description

Thickness
max. 3-4 m

Hierarchy and sequence

Superordinate unit

Palaenography and tectonic

Tectonic unit (resp. main category)
Kind of protolith
  • sedimentary
Conditions of formation

Diagenèse vadose lors de longues périodes d'exposition subaérienne.

Metamorphism
non metamorphic

References

Definition
Rameil N. (2005) : Carbonate sedimentology, sequence stratigraphy, and cyclostratigraphy of the Tithonian in the Swiss and French Jura Mountains: a high-resolution record of changes in sea level and climate GeoFocus 13, 246

Beginning at 140 m [in the Dôle section], parts of the carbonates are dedolomitized and show cornieule-texture. This recrystallization does not follow bed geometries and ends at 148 m with a surface showing prominent solution features. The cornieules are interpreted to result from vadose diagenesis during longer periods of subaerial exposure. These sediments correspond to the so-called “calcaire âpre” (Jaccard 1869). If present, they are used to delimit the top of “Portlandian”, respectively the Twannbach Formation (see Häfeli 1966, Thalmann 1966, Bläsi 1980).
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