Yellow Member

Representation and status

Color CMYK

(0%,0%,0%,100%)

Rank

lithostratigraphic Member (Subformation)

Validity

Unit is in Use

Status

incorrect name (though informally used)

Nomenclature

Deutsch

Gelbes Member

English

Yellow Member

Historical Variants

«yellow member» (Matasci et al. 2011)

Hierarchy and sequence

Units at roof

• White Member

Palaenography and tectonic

Kind of protolith

• sedimentary

Metamorphism

monocyclic

References

Definition

Matasci Battista, Epard Jean-Luc, Masson Henri (2011) : The Teggiolo zone: a key to the Helvetic–Penninic connection (stratigraphy and tectonics in the Val Bavona, Ticino, Central Alps). Swiss J. Geosci. 104, 257–283

p.262: The lower part has a characteristic yellowish to brownish color (‘‘yellow member’’). The base of this member is banded and consists in an alternation of cmor dm-thick beds of slightly impure limestones (10–20% of fine-grained quartz, feldspar, mica and dolomite), with more impure and more coarsely quartzic and micaceous limestones or calcschists (Fig. 3). It passes very progressively upwards, by attenuation of the bedding and increasing purity, to a more homogenous and massive, still yellowish limestone. The protolith of this sequence must have been an alternation of beds of more or less argillaceous limestones and marls, with decreasing upwards content in clay minerals and other fine-grained detritals.