Toarcian
E199528
The Toarcian is a stage of the Early Jurassic period characterized by significant marine life diversification and notable oceanic anoxic events.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Toarcian canonical | 4 |
| Lower Toarcian | 1 |
| Upper Toarcian | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1758854 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
Target entity: Toarcian Context triple: [Early Jurassic, contains, Toarcian]
-
A.
Pliensbachian
The Pliensbachian is a stage of the Early Jurassic period characterized by distinctive marine faunas and important ammonite biostratigraphy.
-
B.
Maastrichtian
The Maastrichtian is the final stage of the Late Cretaceous period, marking the last interval of non-avian dinosaur dominance before the mass extinction event 66 million years ago.
-
C.
Early Jurassic
The Early Jurassic was the first epoch of the Jurassic Period, marked by the recovery of life after the end-Triassic extinction and the early diversification of dinosaurs and marine reptiles.
-
D.
Devonian Period
The Devonian Period was a division of the Paleozoic Era characterized by the diversification of fish, the first significant colonization of land by plants and early tetrapods, and major reef-building in the oceans.
-
E.
Late Triassic
The Late Triassic was a geologic period and epoch, roughly 237–201 million years ago, marked by the diversification of early dinosaurs and the end-Triassic mass extinction that paved the way for Jurassic ecosystems.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
Target entity: Toarcian Target entity description: The Toarcian is a stage of the Early Jurassic period characterized by significant marine life diversification and notable oceanic anoxic events.
-
A.
Pliensbachian
The Pliensbachian is a stage of the Early Jurassic period characterized by distinctive marine faunas and important ammonite biostratigraphy.
-
B.
Maastrichtian
The Maastrichtian is the final stage of the Late Cretaceous period, marking the last interval of non-avian dinosaur dominance before the mass extinction event 66 million years ago.
-
C.
Early Jurassic
The Early Jurassic was the first epoch of the Jurassic Period, marked by the recovery of life after the end-Triassic extinction and the early diversification of dinosaurs and marine reptiles.
-
D.
Devonian Period
The Devonian Period was a division of the Paleozoic Era characterized by the diversification of fish, the first significant colonization of land by plants and early tetrapods, and major reef-building in the oceans.
-
E.
Late Triassic
The Late Triassic was a geologic period and epoch, roughly 237–201 million years ago, marked by the diversification of early dinosaurs and the end-Triassic mass extinction that paved the way for Jurassic ecosystems.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
chronostratigraphic stage
ⓘ
geologic age ⓘ |
| associatedWith |
Karoo-Ferrar large igneous province activity
ⓘ
Toarcian Oceanic Anoxic Event ⓘ climatic warming episode ⓘ enhanced burial of organic carbon ⓘ increased volcanism ⓘ sea-level fluctuations ⓘ |
| baseDefinedBy | first appearance of ammonite Dactylioceras (Eodactylites) simplex ⓘ |
| characterizedBy |
changes in marine plankton communities
ⓘ
faunal turnovers in ammonites ⓘ faunal turnovers in marine reptiles ⓘ global carbon cycle perturbation ⓘ major oceanic anoxic event ⓘ marine extinctions ⓘ pronounced negative carbon isotope excursion ⓘ significant marine life diversification ⓘ widespread organic-rich black shales ⓘ |
| definedBy | Global Boundary Stratotype Section and Point for base at Peniche, Portugal ⓘ |
| follows | Pliensbachian ⓘ |
| hasTypicalFossils |
ammonites
ⓘ
belemnites ⓘ bivalves ⓘ foraminifera ⓘ marine reptiles ⓘ |
| hasTypicalLithology |
black shales
ⓘ
limestones ⓘ marls ⓘ |
| locatedInTimeScale |
Jurassic Period
ⓘ
Mesozoic Era ⓘ |
| namedAfter |
Thouars
ⓘ
Toarcis (Latin name of Thouars) ⓘ |
| partOf |
Early Jurassic
ⓘ
Early Jurassic ⓘ
surface form:
Lower Jurassic Series
|
| precedes | Aalenian ⓘ |
| rank | stage ⓘ |
| recognizedIn |
Asia
ⓘ
Europe ⓘ North Africa ⓘ North America ⓘ South America ⓘ |
| subdividesInto |
Toarcian
self-linksurface differs
ⓘ
surface form:
Lower Toarcian
Middle Toarcian ⓘ Toarcian self-linksurface differs ⓘ
surface form:
Upper Toarcian
|
| timeEnd | approximately 174.1 million years ago ⓘ |
| timeStart | approximately 182.7 million years ago ⓘ |
| topDefinedBy | first appearance of ammonite Leioceras opalinum ⓘ |
| usedIn |
biostratigraphy
ⓘ
chemostratigraphy ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Subject: Toarcian Description of subject: The Toarcian is a stage of the Early Jurassic period characterized by significant marine life diversification and notable oceanic anoxic events.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.