Early Toarcian

Torna a Toarcian (182.7 +/-0.7 Ma)

Rappresentazione e statuto

Colore CMYK
(33%,9%,0%,11%)
Colore RGB
R: 153 G: 206 B: 227
Rango
Sotto-Piano cronostratigrafico
Uso
Unità in uso.
Status
termine formale valido
Discussione del statuto

Nomenclatura

Deutsch
Frühes Toarcien
Français
Toarcien précoce
Italiano
Primo Toarciano
English
Early Toarcian
Varianti storiche

Frühes Toarcium, Frühes Toarc

Gerarchia e successione

Unità di rango inferiore
Unità sovrastante
Limite superiore

Top just below the first appearance of the ammonite genus Hildoceras.

Limite inferiore

Base defined by the first appearance of Eodactylites mirabile (Tethyan Realm), or alternatively by the mass appearance of other dactylioceratids together with Paltarpites paltus.

Età

Geomorfologia
  • primo Toarciano
Osservazioni sul tetto

Serpentinum/Levisoni Zone, Falciferum Subzone

Età alla base
  • primo Toarciano
Osservazioni sulla base

Polymorphum Zone, Mirabile Subzone (Tethyan Realm), approximately equivalent to the Tenuicostatum Zone, Paltum Subzone (NW European Realm)

Metodo di datazione

Ammonite biostratigraphy (mainly dactylioceratids, harpoceratids and early hildoceratids).

  • Toarcian Oceanic Anoxic Event

    Rango
    OAE
    Statuto
    termine informale
    In breve

    Major oceanic anoxic event of the Early Toarcian (around 183 Ma ago), documented by black shale deposits found on all major continents (no oceanic drilling cores have recovered black shales of this age as there is little or no Toarcian ocean crust remaining in the world ocean). This event correlates with a marine extinction event.

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