Early Jurassic (201.3 +/-0.2 Ma)
Representation and status
- Color CMYK
- 75 / 5 / 0 / 0
- Color RGB
- R: 66 G: 174 B: 208
- Rank
- chronostratigraphic Epoch
- Validity
- Unit is in Use
- Status
- valid formal name
- Status discussion
Nomenclature
- Deutsch
- Früher Jura
- Français
- Jurassique précoce
- Italiano
- Giurassico primo
- English
- Early Jurassic (201.3 +/-0.2 Ma)
- Historical Variants
-
Eojurassique (Lugeon 1910: incl. Rhétien et Aalénien), Série paléojurassique (Revil 1911), Lias [sic]
Hierarchy and sequence
- Units at roof
Age
- Age at top
-
- Toarcian
- Age at base
-
- Hettangian
-
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).
- Rank
- chronostratigraphic Stage
- Status
- valid formal name
- Nomenclatorial Remarks
- <p>Latin: Toarcium</p>
- In short
-
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
- Toarcian
-
Late Toarcian
-
Middle Toarcian
- Rank
- chronostratigraphic Substage
- Status
- valid formal name
- In short
- The Middle Toarcian is defined biostratigraphically by the ammonite genera Hildoceras and Haugia.
- Age
- middle Toarcian
-
Early Toarcian
- Rank
- chronostratigraphic Substage
- Status
- valid formal name
- In short
-
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
- early Toarcian
-
Toarcian Oceanic Anoxic Event
- Rank
- Oceanic Anoxic Event
- Status
- informal term
- In short
-
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.
- Rank
- chronostratigraphic Stage
- Status
- valid formal name
- Age
- Pliensbachian
-
Domerian
- Name Origin
-
Named after Monte Domaro (Italia), Val Trompia / Lombardia.
- Rank
- chronostratigraphic Substage
- Status
- informal term
- In short
-
Informal substage corresponding to the late Pliensbachian.
- Age
- spätes Pliensbachien (= Domérien)
-
Carixian
- Name Origin
-
Named after Charmouth (Dorset, UK).
- Rank
- chronostratigraphic Substage
- Status
- informal term
- Nomenclatorial Remarks
- Latin: Carixium
- In short
- 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).
- Rank
- chronostratigraphic Stage
- Status
- valid formal name
- Nomenclatorial Remarks
- <p>Latin: Sinemurium</p>
- Age
- Sinemurian
-
Hettangian (201.3 +/-0.2 Ma)
- Name Origin
-
Named after the town of Hettange (Moselle, N France), just south of the border with Luxembourg,
- Rank
- chronostratigraphic Stage
- Status
- valid formal name
- In short
-
First stage of the Jurassic.
- Age
- Hettangian