Martinsmad-Formation

Rappresentazione e statuto

Colore CMYK

(0%,6%,53%,8%)

Colore RGB

R: 235 G: 220 B: 110

Rango

Formazione litostratigrafica

Uso

Unità in uso.

Status

termine informale

Nomenclatura

Deutsch

Martinsmad-Formation

Français

Formation du Martinsmad

Italiano

Formazione del Martinsmad

English

Martinsmad Formation

Origine del nome

Martinsmaad (GL), Glarus Süd

Varianti storiche

Exponensgrünsand, Flysch von Martinsmad (Leupold 1943, Wegmann 1961), Martinsmad Formation (Menkveld et al. 2016), Martinsmad-Formation (Löpfe et al. 2018)

Nota sul nome

im Martinsmaad ; Maad = Matt (cf. Zer-Matt)

Gerarchia e successione

Unità di rango inferiore

• «Supraquarzitischer Flysch»
• Sardona-Member
• «Infraquarzitischer Flysch»

Limite superiore

Tektonische Grenze.

Limite inferiore

Wang-Fm. (tektonisches Kontakt).

Età

Geomorfologia

• Ypresiano

Età alla base

• Maastrichtiano

Metodo di datazione

Foraminiferen.

Geografia

Estensione geografica

Ostschweiz (Sernftal, Weisstannental).

Località-tipo

• Sardonaalp (SG)
  Caratteristiche del sito
  • typische Fazies
  Agibilità del sito
  • Grat
  Coordinate
  • (2739500 / 1197500)
  Nota
  • Zwischen Piz Sardona und Sardona-Hütte SAC (Menkveld-Gfeller et al. 2016).

Sezione-tipo

• Chli Chamm (SG)
  Caratteristiche del sito
  • typische Fazies
  Agibilità del sito
  • Grat
  Coordinate
  • (2736875 / 1201650)
  Nota
  • Wegmann 1961: unterer Teil
• Weralpgrat (GL)/(SG)
  Caratteristiche del sito
  • typische Fazies
  Agibilità del sito
  • Grat
  Coordinate
  • (2737080 / 1200465)
  Nota
  • Wegmann 1961: oberer Teil

Referenze

Definizione

Menkveld-Gfeller Ursula, Kempf Oliver, Funk Hanspeter (2016) : Lithostratigraphic units of the Helvetic Palaeogene: review, new definition, new classification. Swiss J. Geosc. 109/2, 171-199

p.193: Leupold (1942) first described the ‘‘Sardona-Flysch’’ (i.e., the sediment succession of the Sardona nappe) in detail and subdivided it into Seewen Formation, Amden Marl, Wang Formation, and ‘‘Wildflysch’’. For further descriptions see Arn. Heim (1911), Boussac (1912) for Seewen Formation, Amden-Mergel, and Wang formation, Oberholzer (1933; Glarner «Wildflysch»), Bisig (1957; «Sardonaflysch»); Lihou (1995). Like the Blattengrat Sandstone and the Lavtina Sandstone, the flysch deposits of the Sardona nappe are part of the so called ‘‘wrapped’’ flysch (‘‘eingewickelter Flysch’’, Arn. Heim 1911). The strongly schistous sediment succession is intensely deformed, and Leupold (1942) subdivided the succession into an ‘‘infraquartzitic’’ and ‘‘supraquartzitic’’ flysch. Yet, this subdivision includes non-flysch deposits as well. Thus, we combine all true flysch deposits in the here defined Martinsmad Formation. ‘‘Globotruncanenkalk’’ (=Seewen Formation), ‘‘Globotruncanenmergel’’ (=Amden Marl), ‘‘Freudenbergschiefer’’ and ‘‘Unterer Siderolitheskomplex’’ (=Wang Formation) of Leupold (1942)—all belonging to the older part of the ‘‘infraquartzitic flysch’’— are not further considered. The Martinsmad Formation as defined here comprises the entire succession of true flysch deposits of the Sardona nappe. These are, sensu Wegmann (1961), the ‘‘infraquartzitic flysch’’ pro parte (including ‘‘Kristallinkonglomerate’’ and ‘‘Unterer Ölquarzithorizont’’), the ‘‘Sardonaquarzit’’, and the ‘‘supraquartzitic flysch’’ (comprising ‘‘oberer O¨ lquarzitkomplex’’, ‘‘Fukoidenschiefer’’, ‘‘Siderolitesplatten’’, and ‘‘oberster sandsteinreicher Flysch’’). Based on this classification, Lihou and Allen (1996) introduced a ‘‘Sardona Quartzite Formation’’ composed of four facies associations. Based thereon, we here define the Martinsmad Formation subdivided by the Sardona Quarzite (formal member) informally into a ‘‘lower’’ and ‘‘upper flysch unit’’. The type locality (Leupold 1942) is east of Piz Sardona/Sardona-Hütte SAC (ca. 2739.500/ 1197.500), a type section may be taken from Lihou and Allen (1996). For further descriptions see Arn. Heim (1911), Oberholzer (1933), Leupold (1942), and Wegmann (1961). Lithology: See individual members. Overlying strata: tectonic boundary; underlying strata: Wang Formation, tectonic boundary. Biostratigraphy: Maastrichtian to Ypresian (?earliest Lutetian), foraminifera. Current geographical extent: Eastern Switzerland: Sernf and Weisstannen valley. Tectonic units: Eastern Switzerland: Sardona nappe.