Mesozoic Era

E8188

eon subdivision geological era

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.

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All labels observed (8)

Label	Occurrences
Mesozoic	97
Mesozoic Era canonical	60
Mesozoic era	35
Age of Dinosaurs	1
Age of Reptiles	1
Mesozoic System	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 mass extinction ⓘ linked to: Cretaceous–Paleogene boundary
endTime	about 66 million years ago ⓘ
followedBy	Cenozoic Era ⓘ linked to: Cenozoic
follows	Paleozoic Era ⓘ
hasPart	Cretaceous Period ⓘ linked to: Cretaceous Jurassic Period ⓘ Triassic Period ⓘ linked to: Triassic
majorLifeForm	ammonites ⓘ early angiosperms ⓘ early birds ⓘ early mammals ⓘ gymnosperms ⓘ marine reptiles ⓘ non-avian dinosaurs ⓘ pterosaurs ⓘ
massExtinctionCount	two major mass extinctions at its boundaries ⓘ
nicknamed	Age of Dinosaurs ⓘ linked to: Mesozoic Era Age of Reptiles ⓘ linked to: Mesozoic Era
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

Referenced by (197)

Full triples — surface form annotated when it differs from this entity's canonical label.

Cretaceous → partOf → Mesozoic Era ⓘ

Jurassic → partOf → Mesozoic Era ⓘ

Cretaceous–Paleogene boundary → marksEndOf → Mesozoic Era ⓘ

Jurassic Period → partOf → Mesozoic Era ⓘ

Pinales → diversifiedIn → MesozoicEra ⓘ

linked to: Mesozoic Era

Mesozoic Era → nicknamed → Age of Reptiles ⓘ

linked to: Mesozoic Era

Mesozoic Era → nicknamed → Age of Dinosaurs ⓘ

linked to: Mesozoic Era

Verkhoyansk Range → geologicalPeriod → Mesozoic ⓘ

linked to: Mesozoic Era

Evolving Planet → coversTimePeriod → Mesozoic ⓘ

linked to: Mesozoic Era

Phanerozoic Eon → contains → Mesozoic Era ⓘ

Phanerozoic Eon → middleEra → Mesozoic Era ⓘ

Pentelic marble → geologicalAge → Mesozoic ⓘ

linked to: Mesozoic Era

Paleozoic Era → precedes → Mesozoic Era ⓘ

Eastern Cordillera → geologicalEra → Mesozoic ⓘ

linked to: Mesozoic Era

Cenozoic → follows → Mesozoic ⓘ

linked to: Mesozoic Era

Cenozoic → precededBy → Mesozoic Era ⓘ

Farallon Plate → timeActive → Mesozoic era ⓘ

linked to: Mesozoic Era

Araucaria → fossilRecord → Mesozoic era ⓘ

linked to: Mesozoic Era

Kolyma Mountains → geologicalEra → Mesozoic ⓘ

linked to: Mesozoic Era

Ligurian Alps → geologicalEra → Mesozoic ⓘ

linked to: Mesozoic Era

Triassic → partOf → Mesozoic Era ⓘ

International Chronostratigraphic Chart → includes → Mesozoic Era ⓘ

Acipenseriformes → timeOfOrigin → Mesozoic era ⓘ

linked to: Mesozoic Era

Permian–Triassic mass extinction → marksBoundaryBetween → Mesozoic era ⓘ

linked to: Mesozoic Era

Paris Basin → geologicalEra → Mesozoic ⓘ

linked to: Mesozoic Era

Mount Pentelicus → geologicalEra → Mesozoic ⓘ

linked to: Mesozoic Era

Jessica Whiteside → studiesPeriod → Mesozoic Era ⓘ

Late Jurassic → subdivisionOf → Mesozoic Era ⓘ

Yan Mountains → geologicalAge → Mesozoic ⓘ

linked to: Mesozoic Era

Mount Taygetus → geologicalPeriod → Mesozoic ⓘ

linked to: Mesozoic Era

Amerasian Basin → formedDuring → Mesozoic era ⓘ

linked to: Mesozoic Era

Maastrichtian → era → Mesozoic Era ⓘ

Permian Period → followedByEvent → Mesozoic Era ⓘ

Southern Limestone Alps → geologicalAge → Mesozoic ⓘ

linked to: Mesozoic Era

Central Atlantic Ocean floor → developedSince → Mesozoic era ⓘ

linked to: Mesozoic Era

Colorado National Monument → geologicEra → Mesozoic ⓘ

linked to: Mesozoic Era

Chatyr-Dag → geologicalAge → Mesozoic ⓘ

linked to: Mesozoic Era

Peninsular Ranges Batholith → ageRange → Mesozoic Era ⓘ

Castle Crags → geologicalAge → Mesozoic ⓘ

linked to: Mesozoic Era

Calico Hills → formationPeriod → Mesozoic era ⓘ

linked to: Mesozoic Era

Kunlun Mountains → geologicalAge → Mesozoic ⓘ

linked to: Mesozoic Era

Chesil Beach → geologicalPeriodRepresented → Mesozoic ⓘ

linked to: Mesozoic Era

Dorset and East Devon Coast → geologicalTimeSpan → Mesozoic Era ⓘ

Squamata → geologicalFirstAppearance → Mesozoic Era ⓘ

Kula Plate → geologicalAge → Mesozoic ⓘ

linked to: Mesozoic Era

Big Round Top → formedDuring → Mesozoic era ⓘ

linked to: Mesozoic Era

Sichuan Basin → geologicalEraOfFormation → Mesozoic ⓘ

linked to: Mesozoic Era

Kayenta Formation → stratigraphicUnitOf → Mesozoic Era ⓘ

Viñales Valley → geologicalAge → Mesozoic ⓘ

linked to: Mesozoic Era

San Rafael Swell → geologicAge → Mesozoic ⓘ

linked to: Mesozoic Era

All labels observed (8)

How this entity was disambiguated Show

Statements (47)

How these facts were elicited Show

Referenced by (197)

How this entity was disambiguated

How these facts were elicited