«Fleckenkalkflysch» («Neokom»)

Torna a Tristel-Formation

Rappresentazione e statuto

Index
Cn, FN, c1-4
Colore CMYK
(19%,0%,26%,18%)
Colore RGB
R: 170 G: 210 B: 155
Rango
Formazione litostratigrafica
Uso
Unità in uso.
Status
termine scorretto (informale)

Nomenclatura

Deutsch
«Fleckenkalkflysch» («Neokom»)
Français
«Fleckenkalkflysch» («Néocomien»)
Italiano
«Fleckenkalkflysch» («Neocomiano»)
English
«Fleckenkalkflysch» («Neocomian»)
Origine del nome

Frühkretazischer («Neokom»), flysch-artiger Mergelkalk mit Bioturbationsflecken.

Varianti storiche

Néocomien des Préalpes (Schardt 1899), Neokom (Trümpy 1916, Cadisch et al. 1919, Häfner 1926, Allemann & Blaser 1951, Gees 1954), Neokomschiefer (Ucik 1966, Thum 1966, Gruber et al. 2010), Neokom = tiefere Unterkreide (Dössegger 1987, Trümpy et al. 1997), Neokomflysch-Serie (Alleman 1957), Untere Kreide = Neokom (Cadisch et al. 1968), Shale Formation = Neokom (Florineth & Froitzheim 1994), "Neokom"-Serie (Gürler 1995 S.26), Fleckenkalk-Flysch, Neokomschiefer (Bertle 2002), Neocom schists (Bertle 2004), Neokom-Flysch (Friebe 2007), Tithon-Neokomflysche

Descrizione

Descrizione

sandige, z.T. feinbrekziöse Kalkschiefer

Potenza
0-60 m (Cadisch et al. 1919)

Gerarchia e successione

Unità sovrastante
Unità sottostante
Limite superiore

Allmählicher Übergang zur Tristel-Formation

Limite inferiore

Malm, Lias oder direkt auf dem Kristallin

Età

Geomorfologia
  • Primo Cretacico
Età alla base
  • Primo Cretacico
Metodo di datazione

Älter als die hangende Tristel-Formation.

Geografia

Località-tipo
  • Matruela (GR)
    Caratteristiche del sito
    • typische Fazies
    Agibilità del sito
    • Steinbruch, Tongrube
    Coordinate
    • (2759330 / 1217870)
    Nota
    • <p>Typlokalität&nbsp;«Neokom-Flysch» (Rutsch et al. 1966)</p>

Paleogeografia e tettonica

Tipo di origine
  • sedimentaria
Condizioni di formazione

Postrift Sedimente in «präflysch»-Fazies (Zoophycos).

Referenze

Revisione
Florineth Duri, Froitzheim Nikolaus (1994) : Transition from continental to oceanic basement in the Tasna nappe (Engadine window, Graubünden, Switzerland): evidence for Early Cretaceous opening of the Valais ocean. Schweiz. min. petrogr. Mitt. 74/3, 437–448

p.441: The Cretaceous sequence of the study area begins with dark gre to olive green shale and siltstone, often strongly bioturbated, in which some limestone layers are intercalated.These rocks, of Early Cretaceous age ("Neokom") according to Kläy (1957) and Cadisch et al. (1968), have not yet been dated biostratigraphically and will therefore be informally referred to as "Shale Formation" in the following. We assume that the Lower Cretaceous age inferred by the above authors is correct, because we observed, particularly clearly on the southern slope of Piz Tasna, a gradational upward transition of the Shale Formation into the Tristel Formation, dated as Late Barremian to Early Aptian (Schwizer 1983). This interpretation is in contrast to Gürler (1982) who postulated a tectonic separation between the Shale Formation and the Tristel Formation. We found no evidence for such a tectonic contact, neither did Schwizer (1983) who studied the Tristel Formation of the Tasna nappe in great detail. Of special interest is the occurence of manganese nodules in the Shale Formation in the vicinity of the underlying Piz Nair serpentinite (Kläy 1957).

Pubblicazioni importanti
Allemann Franz (2002) : Erläuterungen zur geologischen Karte des Fürstentums Liechtenstein 1:25 000. Regierung des Fürstentums Liechtenstein (Vaduz), 129 S.
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