Early Toarcian
Zurück zu ZeitskalaDarstellung 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
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- Early Toarcian
- Historische Varianten
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Frühes Toarcium, Frühes Toarc
Hierarchie und Abfolge
- Untergeordnete Einheiten
- Hangendes
- Obergrenze
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Top just below the first appearance of the ammonite genus Hildoceras.
- Untergrenze
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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
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Serpentinum/Levisoni Zone, Falciferum Subzone
- Alter Basis
-
- frühes Toarcien
- Bermerkungen zu Basis
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Polymorphum Zone, Mirabile Subzone (Tethyan Realm), approximately equivalent to the Tenuicostatum Zone, Paltum Subzone (NW European Realm)
- Datierungsmethode
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Ammonite biostratigraphy (mainly dactylioceratids, harpoceratids and early hildoceratids).
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Toarcian Oceanic Anoxic Event
- Rang
- OAE
- Status
- informeller Begriff
- Kurzbeschreibung
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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.