Mesozoic Era
E8188
The Mesozoic Era was a major geological era, often called the "Age of Reptiles," during which dinosaurs dominated the land and the supercontinent Pangaea broke apart into modern continents.
All labels observed (7)
| Label | Occurrences |
|---|---|
| Mesozoic | 56 |
| Mesozoic Era canonical | 36 |
| Mesozoic era | 18 |
| Age of Dinosaurs | 1 |
| Age of Reptiles | 1 |
| Mesozoic erathem | 1 |
| MesozoicEra | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T72225 — 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: Mesozoic Era Context triple: [Cretaceous, partOf, Mesozoic Era]
-
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.
Proterozoic Eon
The Proterozoic Eon is a major division of Precambrian time, spanning from about 2.5 billion to 541 million years ago, marked by the buildup of atmospheric oxygen, the emergence of complex single-celled and early multicellular life, and the assembly of large continental landmasses.
-
C.
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.
-
D.
Cretaceous–Paleogene boundary
The Cretaceous–Paleogene boundary marks the geological transition 66 million years ago associated with a mass extinction event that wiped out non-avian dinosaurs and many other species, likely triggered by a large asteroid impact.
-
E.
Jurassic
Jurassic is a geologic period of the Mesozoic Era known for its abundant dinosaurs and the breakup of the supercontinent Pangaea.
- 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: Mesozoic Era Target entity description: The Mesozoic Era was a major geological era, often called the "Age of Reptiles," during which dinosaurs dominated the land and the supercontinent Pangaea broke apart into modern continents.
-
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.
Proterozoic Eon
The Proterozoic Eon is a major division of Precambrian time, spanning from about 2.5 billion to 541 million years ago, marked by the buildup of atmospheric oxygen, the emergence of complex single-celled and early multicellular life, and the assembly of large continental landmasses.
-
C.
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.
-
D.
Cretaceous–Paleogene boundary
The Cretaceous–Paleogene boundary marks the geological transition 66 million years ago associated with a mass extinction event that wiped out non-avian dinosaurs and many other species, likely triggered by a large asteroid impact.
-
E.
Jurassic
Jurassic is a geologic period of the Mesozoic Era known for its abundant dinosaurs and the breakup of the supercontinent Pangaea.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
eon subdivision
ⓘ
geological era ⓘ |
| biologicalInnovation |
diversification of reptiles
ⓘ
early diversification of mammals ⓘ evolution of true birds from theropod dinosaurs ⓘ origin of flowering plants ⓘ |
| characterizedBy |
breakup of supercontinent Pangaea
ⓘ
dominance of dinosaurs on land ⓘ high sea levels for much of the era ⓘ warm global climate ⓘ |
| climate |
generally greenhouse conditions
ⓘ
little to no polar ice for much of the era ⓘ |
| duration | about 186 million years ⓘ |
| endedByEvent |
Cretaceous–Paleogene boundary
ⓘ
surface form:
Cretaceous–Paleogene mass extinction
|
| endTime | about 66 million years ago ⓘ |
| followedBy |
Cenozoic
ⓘ
surface form:
Cenozoic Era
|
| follows | Paleozoic Era ⓘ |
| hasPart |
Cretaceous
ⓘ
surface form:
Cretaceous Period
Jurassic Period ⓘ Triassic ⓘ
surface form:
Triassic Period
|
| majorLifeForm |
ammonites
ⓘ
early angiosperms ⓘ early birds ⓘ early mammals ⓘ gymnosperms ⓘ marine reptiles ⓘ non-avian dinosaurs ⓘ pterosaurs ⓘ |
| massExtinctionCount | two major mass extinctions at its boundaries ⓘ |
| nicknamed |
Mesozoic Era
self-linksurface differs
ⓘ
surface form:
Age of Dinosaurs
Mesozoic Era self-linksurface differs ⓘ
surface form:
Age of Reptiles
|
| notableEvent |
appearance of the first flowering plants
ⓘ
extinction of non-avian dinosaurs at its end ⓘ rise and radiation of dinosaurs ⓘ |
| oceanLife |
abundant ammonites and belemnites
ⓘ
diverse marine reptiles such as ichthyosaurs and plesiosaurs ⓘ |
| paleogeography |
continents initially united as Pangaea
ⓘ
further fragmentation into modern continents ⓘ progressive separation into Laurasia and Gondwana ⓘ |
| partOf | Phanerozoic Eon ⓘ |
| precededByEvent | Permian–Triassic mass extinction ⓘ |
| startTime | about 252 million years ago ⓘ |
| stratigraphicUnit | middle era of the Phanerozoic Eon ⓘ |
| tectonicProcess |
formation of modern continental configurations
ⓘ
opening of the Atlantic Ocean ⓘ rifting of Pangaea ⓘ |
| timeScalePosition | between 252 and 66 million years ago ⓘ |
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: Mesozoic Era Description of subject: The Mesozoic Era was a major geological era, often called the "Age of Reptiles," during which dinosaurs dominated the land and the supercontinent Pangaea broke apart into modern continents.
Referenced by (114)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
MesozoicEra
this entity surface form:
Age of Reptiles
this entity surface form:
Age of Dinosaurs
this entity surface form:
Mesozoic
this entity surface form:
Mesozoic
this entity surface form:
Mesozoic
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Mesozoic
this entity surface form:
Mesozoic era
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Mesozoic era
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Mesozoic
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Mesozoic
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Mesozoic era
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Mesozoic era
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Mesozoic
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Mesozoic
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Mesozoic
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Mesozoic
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Mesozoic era
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Mesozoic
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Mesozoic era
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Mesozoic
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Mesozoic
this entity surface form:
Mesozoic
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Mesozoic era
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Mesozoic
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Mesozoic
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Mesozoic
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Mesozoic era
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Mesozoic
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Mesozoic
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Mesozoic