Maastrichtian
E73999
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.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Maastrichtian canonical | 13 |
| Maastrichtian Age | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T593657 — 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: Maastrichtian Context triple: [SUE the T. rex, geologicalStage, Maastrichtian]
-
A.
Cretaceous
The Cretaceous was the final period of the Mesozoic Era, marked by high sea levels, diverse dinosaurs, and ending with the mass extinction that wiped them out about 66 million years ago.
-
B.
Neogene
The Neogene is a geologic period of the Cenozoic Era characterized by significant climatic cooling, the diversification of mammals and birds, and the emergence and evolution of early hominins.
-
C.
Paleogene
The Paleogene is a geologic period that marks the beginning of the Cenozoic Era, characterized by the diversification of mammals and birds following the mass extinction that ended the age of dinosaurs.
-
D.
Pliocene epoch
The Pliocene epoch was a geological time period roughly 5.3 to 2.6 million years ago marked by cooler global climates, the expansion of grasslands, and significant evolutionary developments among mammals and early hominins.
-
E.
Cenozoic
The Cenozoic is the current geological era, beginning about 66 million years ago, characterized by the rise and diversification of mammals and birds and the formation of many modern mountain ranges and continents.
- 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: Maastrichtian Target entity description: 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.
-
A.
Cretaceous
The Cretaceous was the final period of the Mesozoic Era, marked by high sea levels, diverse dinosaurs, and ending with the mass extinction that wiped them out about 66 million years ago.
-
B.
Neogene
The Neogene is a geologic period of the Cenozoic Era characterized by significant climatic cooling, the diversification of mammals and birds, and the emergence and evolution of early hominins.
-
C.
Paleogene
The Paleogene is a geologic period that marks the beginning of the Cenozoic Era, characterized by the diversification of mammals and birds following the mass extinction that ended the age of dinosaurs.
-
D.
Pliocene epoch
The Pliocene epoch was a geological time period roughly 5.3 to 2.6 million years ago marked by cooler global climates, the expansion of grasslands, and significant evolutionary developments among mammals and early hominins.
-
E.
Cenozoic
The Cenozoic is the current geological era, beginning about 66 million years ago, characterized by the rise and diversification of mammals and birds and the formation of many modern mountain ranges and continents.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
Upper Cretaceous stage
ⓘ
chronostratigraphic stage ⓘ geologic age ⓘ |
| associatedWith |
Cretaceous–Paleogene boundary
ⓘ
surface form:
Cretaceous–Paleogene extinction event
|
| biostratigraphicMarkers |
ammonite zones
ⓘ
planktonic foraminifera zones ⓘ |
| characterizedBy | non-avian dinosaur dominance ⓘ |
| chronologicalRank | stage ⓘ |
| climate | generally warm greenhouse climate ⓘ |
| commonDeposits |
chalk
ⓘ
limestone ⓘ |
| definedBy | Global Boundary Stratotype Section and Point ⓘ |
| duration | about 6.1 million years ⓘ |
| end | approximately 66.0 million years ago ⓘ |
| endOf |
Cretaceous
ⓘ
surface form:
Cretaceous Period
|
| endsWith |
Cretaceous–Paleogene boundary
ⓘ
surface form:
Cretaceous–Paleogene extinction event
|
| era | Mesozoic Era ⓘ |
| follows | Campanian ⓘ |
| geochronologicEquivalent |
Maastrichtian
self-linksurface differs
ⓘ
surface form:
Maastrichtian Age
|
| GSSPApprovalYear | 1995 ⓘ |
| GSSPLocation | Tercis-les-Bains, France ⓘ |
| importantFossilGroups |
ammonites
ⓘ
dinosaurs ⓘ foraminifera ⓘ marine reptiles ⓘ planktonic microfossils ⓘ rudists ⓘ |
| lithostratigraphicCorrelation | Maastricht Formation in the Netherlands ⓘ |
| majorExtinction |
ammonites
ⓘ
many marine reptiles ⓘ many planktonic foraminifera ⓘ non-avian dinosaurs ⓘ |
| namedAfter |
Maastricht
ⓘ
Maastricht ⓘ
surface form:
Maastricht, Netherlands
|
| notableEvent | Chicxulub impact at its end ⓘ |
| partOf |
Cretaceous
ⓘ
surface form:
Cretaceous Period
Late Cretaceous ⓘ |
| positionInCretaceous | last stage of the Cretaceous ⓘ |
| positionInMesozoic | last stage of the Mesozoic Era ⓘ |
| precedes | Danian ⓘ |
| seaLevel | high global sea levels ⓘ |
| series |
Cretaceous
ⓘ
surface form:
Upper Cretaceous Series
|
| start | approximately 72.1 million years ago ⓘ |
| system |
Cretaceous
ⓘ
surface form:
Cretaceous System
|
| timeScale | International Chronostratigraphic Chart ⓘ |
| usedIn |
geologic time scale
ⓘ
paleontology ⓘ stratigraphy ⓘ |
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: Maastrichtian Description of subject: 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.
Referenced by (14)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Maastrichtian Age
subject surface form:
Maastricht Formation
subject surface form:
Maastricht Formation