Early Toarcian

Darstellung und Status

Farbe CMYK
(33%,9%,0%,11%)
Farbe RGB
R: 153 G: 206 B: 227
Rang
chronostratigraphische Sub-Stufe
Gebrauch
Element ist in Gebrauch
Status
gültiger formeller Begriff
Diskussion des Status

Nomenklatur

Deutsch
Frühes Toarcien
Français
Toarcien précoce
Italiano
Primo Toarciano
English
Early Toarcian
Historische Varianten

Frühes Toarcium, Frühes Toarc

Hierarchie und Abfolge

Untergeordnete Einheiten
Obergrenze

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

Untergrenze

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

Alter

Alter Top
  • frühes Toarcien
Bermerkungen zu Top

Serpentinum/Levisoni Zone, Falciferum Subzone

Alter Basis
  • frühes Toarcien
Bermerkungen zu Basis

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

Datierungsmethode

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

  • Toarcian Oceanic Anoxic Event

    Rang
    OAE
    Status
    informeller Begriff
    Kurzbeschreibung

    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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