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 (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 ⓘ