Early Toarcian
Représentation et statut
- Couleur CMYK
- (33%,9%,0%,11%)
- Couleur RGB
- R: 153 G: 206 B: 227
- Rang
- Sous-Étage chronostratigraphique
- Usage
- Ce terme est en usage.
- Status
- terme formel valide
- Discussion du statut
Nomenclature
- Deutsch
- Frühes Toarcien
- Français
- Toarcien précoce
- Italiano
- Primo Toarciano
- English
- Early Toarcian
- Variantes historiques
-
Frühes Toarcium, Frühes Toarc
Hiérarchie et succession
- Unités hiérarchiquement subordonnées
- Unités sus-jacentes
- Limite supérieure
-
Top just below the first appearance of the ammonite genus Hildoceras.
- Limite inférieure
-
Base defined by the first appearance of Eodactylites mirabile (Tethyan Realm), or alternatively by the mass appearance of other dactylioceratids together with Paltarpites paltus.
Âge
- Âge au sommet
-
- Toarcien précoce
- Note sur le sommet
-
Serpentinum/Levisoni Zone, Falciferum Subzone
- Âge à la base
-
- Toarcien précoce
- Note sur la base
-
Polymorphum Zone, Mirabile Subzone (Tethyan Realm), approximately equivalent to the Tenuicostatum Zone, Paltum Subzone (NW European Realm)
- Méthode de datation
-
Ammonite biostratigraphy (mainly dactylioceratids, harpoceratids and early hildoceratids).
-
Toarcian Oceanic Anoxic Event
- Rang
- OAE
- Statut
- terme informel
- En bref
-
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.