Early Jurassic (201.3 +/-0.2 Ma)
Représentation et statut
- Couleur CMYK
- 75 / 5 / 0 / 0
- Couleur RGB
- R: 66 G: 174 B: 208
- Rang
- Époque chronostratigraphique
- Usage
- Ce terme est en usage.
- Status
- terme formel valide
- Discussion du statut
Nomenclature
- Deutsch
- Früher Jura
- Français
- Jurassique précoce
- Italiano
- Giurassico primo
- English
- Early Jurassic (201.3 +/-0.2 Ma)
- Variantes historiques
-
Eojurassique (Lugeon 1910: incl. Rhétien et Aalénien), Série paléojurassique (Revil 1911), Lias [sic]
Hiérarchie et succession
- Unités hiérarchiquement subordonnées
- Unités sus-jacentes
Âge
- Âge au sommet
-
- Toarcien
- Âge à la base
-
- Hettangien
-
Toarcian (184.2 +/-0.3 Ma)
- Name Origin
-
Named after the town of Thouars (Deux-Sèvres, France), south of Saumur. The protected stratotype lies in an old quarry. Its GSSP is located at Peniche (Portugal).
- Rang
- Étage chronostratigraphique
- Statut
- terme formel valide
- Nomenclatorial Remarks
- <p>Latin: Toarcium</p>
- En bref
-
The Toarcian is the youngest geochronologic age of the Early Jurassic. Its base, at the transition from the Pliensbachian, is placed at the first appearance of the ammonite genus Eodactylites and the base of the Aalenian (first appearance of the ammonite genus Leioceras) defines its end.
The Pliensbachian/Toarcian boundary is marked by a major faunal turnover and regional stratigraphic gaps, followed by a global Oceanic Anoxic Event (OAE) recorded as black shales (such as the well-known «Posidonienschiefer» of Southern Germany, equivalent to the French «schistes-carton»).
- Age
- Toarcien
-
Late Toarcian
- Rang
- Sous-Étage chronostratigraphique
- Statut
- terme formel valide
- Age
- Toarcien tardif
-
Middle Toarcian
- Rang
- Sous-Étage chronostratigraphique
- Statut
- terme formel valide
- En bref
- The Middle Toarcian is defined biostratigraphically by the ammonite genera Hildoceras and Haugia.
- Age
- Toarcien moyen
-
Early Toarcian
- Rang
- Sous-Étage chronostratigraphique
- Statut
- terme formel valide
- En bref
-
The Early Toarcian is characterized almost worldwide by black shales (among which the well-known «Posidonienschiefer» of Southern Germany, and the French «schistes-carton») with an ammonite fauna composed mainly of dactylioceratids, harpoceratids and early hildoceratids.
- Age
- Toarcien précoce
-
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.
-
Pliensbachian (190.8 +/-1.0 Ma)
- Name Origin
-
Named after the village of Pliensbach (Baden-Württemberg, S Germany), 30 km E Stuttgart.
- Rang
- Étage chronostratigraphique
- Statut
- terme formel valide
- Age
- Pliensbachien
-
Domerian
- Name Origin
-
Named after Monte Domaro (Italia), Val Trompia / Lombardia.
- Rang
- Sous-Étage chronostratigraphique
- Statut
- terme informel
- En bref
-
Informal substage corresponding to the late Pliensbachian.
- Age
- spätes Pliensbachien (= Domérien)
-
Carixian
- Name Origin
-
Named after Charmouth (Dorset, UK).
- Rang
- Sous-Étage chronostratigraphique
- Statut
- terme informel
- Nomenclatorial Remarks
- Latin: Carixium
- En bref
- First, informal substage of the Pliensbachian.
- Age
- frühes Pliensbachien (= Carixien)
-
Sinemurian (199.3 +/-0.3 Ma)
- Name Origin
-
Named after the town of Sémur-en-Auxois (Côte-d'Or, France).
- Rang
- Étage chronostratigraphique
- Statut
- terme formel valide
- Nomenclatorial Remarks
- <p>Latin: Sinemurium</p>
- Age
- Sinémurien
-
Hettangian (201.3 +/-0.2 Ma)
- Name Origin
-
Named after the town of Hettange (Moselle, N France), just south of the border with Luxembourg,
- Rang
- Étage chronostratigraphique
- Statut
- terme formel valide
- En bref
-
First stage of the Jurassic.
- Age
- Hettangien