Early Toarcian
Torna a Toarcian (184.2 +/-0.3 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.