Rhaetian Stage
E727681
The Rhaetian Stage is the final stage of the Late Triassic period, marked by significant marine extinctions and preceding the Triassic–Jurassic boundary.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Rhaetian Stage canonical | 1 |
| Rhaetian stage | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T8356815 — 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.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Rhaetian Stage Context triple: [Global Boundary Stratotype Section and Point for base of Hettangian, follows, Rhaetian Stage]
-
A.
Cisuralian Epoch
The Cisuralian Epoch is the earliest subdivision of the Permian, marking a time of significant diversification of terrestrial life and continued development of early amniotes following the late Paleozoic ice age.
-
B.
Ludfordian Age
The Ludfordian Age is a late Silurian time interval characterized by significant marine biodiversity changes and notable graptolite and conodont fossil assemblages.
-
C.
Lochkovian Epoch
The Lochkovian Epoch is the earliest subdivision of the Devonian Period, marking a time of significant diversification in early fish and terrestrial ecosystems.
-
D.
Hettangian stage
The Hettangian stage is the earliest age of the Jurassic Period, marking the beginning of the Mesozoic era’s Jurassic system in the geologic time scale.
-
E.
Pridoli Epoch
The Pridoli Epoch is the final epoch of the Silurian Period, marking a transitional interval in Earth’s history just before the onset of the Devonian.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Rhaetian Stage Target entity description: The Rhaetian Stage is the final stage of the Late Triassic period, marked by significant marine extinctions and preceding the Triassic–Jurassic boundary.
-
A.
Cisuralian Epoch
The Cisuralian Epoch is the earliest subdivision of the Permian, marking a time of significant diversification of terrestrial life and continued development of early amniotes following the late Paleozoic ice age.
-
B.
Ludfordian Age
The Ludfordian Age is a late Silurian time interval characterized by significant marine biodiversity changes and notable graptolite and conodont fossil assemblages.
-
C.
Lochkovian Epoch
The Lochkovian Epoch is the earliest subdivision of the Devonian Period, marking a time of significant diversification in early fish and terrestrial ecosystems.
-
D.
Hettangian stage
The Hettangian stage is the earliest age of the Jurassic Period, marking the beginning of the Mesozoic era’s Jurassic system in the geologic time scale.
-
E.
Pridoli Epoch
The Pridoli Epoch is the final epoch of the Silurian Period, marking a transitional interval in Earth’s history just before the onset of the Devonian.
- F. None of above. chosen
Statements (44)
| Predicate | Object |
|---|---|
| instanceOf |
Upper Triassic stage
ⓘ
geologic time interval ⓘ |
| associatedWith |
changes in ammonoid assemblages
ⓘ
changes in conodont assemblages ⓘ changes in palynofloral assemblages ⓘ decline of many Triassic marine reptile groups ⓘ |
| biostratigraphicMarkers |
ammonoid biozones
ⓘ
conodont biozones ⓘ palynological zones ⓘ |
| characterizedBy |
faunal turnover before Triassic–Jurassic extinction
ⓘ
reef crises in shallow marine environments ⓘ significant marine extinctions ⓘ widespread marine regression and transgression events ⓘ |
| contains |
continental sedimentary successions
ⓘ
marine sedimentary successions ⓘ |
| correlatesWith |
upper part of Keuper in central Europe
ⓘ
upper part of Newark Supergroup in eastern North America ⓘ |
| endsWith |
Triassic–Jurassic boundary
ⓘ
linked to:
Triassic–Jurassic extinction event
|
| environmentalChanges |
climatic instability before Jurassic
ⓘ
episodes of oceanic anoxia in some basins ⓘ perturbations in carbon cycle ⓘ |
| equivalentChron |
Rhaetian Age
ⓘ
linked to:
Rhaetian age
|
| follows |
Norian Stage
ⓘ
middle Norian substage ⓘ |
| isFinalStageOf |
Late Triassic
ⓘ
Triassic Period ⓘ
linked to:
Triassic
|
| lowerBoundaryDefines | top of Norian Stage ⓘ |
| namedAfter | Rhaetian Alps ⓘ |
| partOf |
Late Triassic
ⓘ
Upper Triassic Series ⓘ
linked to:
Late Triassic
|
| positionInEon | Phanerozoic Eon ⓘ |
| positionInEra | Mesozoic Era ⓘ |
| positionInPeriod |
Triassic Period
ⓘ
linked to:
Triassic
|
| positionInSystem |
Triassic System
ⓘ
linked to:
Triassic
|
| precedes |
Early Jurassic
ⓘ
Hettangian Stage ⓘ
linked to:
Hettangian stage
|
| rank | stage ⓘ |
| temporalRelation | immediately precedes end-Triassic mass extinction ⓘ |
| timeSpan | latest Triassic ⓘ |
| upperBoundaryDefines |
Triassic–Jurassic boundary
ⓘ
linked to:
Triassic–Jurassic extinction event
base of Hettangian Stage ⓘ base of Jurassic System ⓘ |
| usedBy | International Commission on Stratigraphy ⓘ |
| usedIn | International Chronostratigraphic Chart ⓘ |
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.
Instruction
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.
Input
Subject: Rhaetian Stage Description of subject: The Rhaetian Stage is the final stage of the Late Triassic period, marked by significant marine extinctions and preceding the Triassic–Jurassic boundary.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Rhaetian Stage