Cretaceous
E1446
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.
All labels observed (8)
| Label | Occurrences |
|---|---|
| Cretaceous canonical | 24 |
| Cretaceous period | 13 |
| Cretaceous Period | 9 |
| Late Cretaceous | 3 |
| Cretaceous System | 1 |
| Cretaceous–Paleogene extinction event | 1 |
| Early Cretaceous | 1 |
| Upper Cretaceous Series | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T12636 — 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: Cretaceous Context triple: [Mount Whitney, geologicalAge, Cretaceous]
-
A.
Pacific Ring of Fire
The Pacific Ring of Fire is a vast, horseshoe-shaped zone encircling the Pacific Ocean that is renowned for its intense seismic activity, frequent earthquakes, and numerous active volcanoes.
-
B.
Great Lakes
The Great Lakes are a chain of five vast freshwater lakes in North America that form the largest group of freshwater lakes on Earth by total area and are a critical hub for transportation, industry, and ecology.
-
C.
Cold War
The Cold War was a prolonged period of geopolitical tension and ideological rivalry between the United States and its allies and the Soviet Union and its allies, spanning roughly from the late 1940s to the early 1990s.
-
D.
Gilded Age
The Gilded Age was a late 19th-century period in the United States marked by rapid industrialization, vast wealth accumulation, stark social inequality, and influential business magnates like Andrew Carnegie.
-
E.
North American Cordillera
The North American Cordillera is the vast, complex chain of mountain ranges running along western North America from Alaska through Canada and the United States into Mexico, encompassing systems such as the Rockies and the Sierra Nevada.
- 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: Cretaceous Target entity description: 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.
-
A.
Pacific Ring of Fire
The Pacific Ring of Fire is a vast, horseshoe-shaped zone encircling the Pacific Ocean that is renowned for its intense seismic activity, frequent earthquakes, and numerous active volcanoes.
-
B.
Great Lakes
The Great Lakes are a chain of five vast freshwater lakes in North America that form the largest group of freshwater lakes on Earth by total area and are a critical hub for transportation, industry, and ecology.
-
C.
Cold War
The Cold War was a prolonged period of geopolitical tension and ideological rivalry between the United States and its allies and the Soviet Union and its allies, spanning roughly from the late 1940s to the early 1990s.
-
D.
Gilded Age
The Gilded Age was a late 19th-century period in the United States marked by rapid industrialization, vast wealth accumulation, stark social inequality, and influential business magnates like Andrew Carnegie.
-
E.
North American Cordillera
The North American Cordillera is the vast, complex chain of mountain ranges running along western North America from Alaska through Canada and the United States into Mexico, encompassing systems such as the Rockies and the Sierra Nevada.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
geological period
ⓘ
stratigraphic unit ⓘ |
| associatedWith |
Cretaceous–Paleogene boundary
ⓘ
surface form:
Chicxulub impact event
Deccan Traps volcanism ⓘ |
| biota |
abundant ammonites in marine ecosystems
ⓘ
diverse theropod and sauropod dinosaurs ⓘ dominance of conifers in many forests ⓘ early evolution of marsupial mammals ⓘ early evolution of placental mammals ⓘ expansion of reef-building rudist bivalves ⓘ |
| characterizedBy |
active plate tectonics
ⓘ
breakup of supercontinent Pangaea ⓘ chalk deposition in many marine basins ⓘ diverse dinosaur faunas ⓘ extensive shallow epicontinental seas ⓘ flowering plant diversification ⓘ high global sea levels ⓘ warm greenhouse climate ⓘ |
| chronostratigraphicRank | system ⓘ |
| climate |
generally ice-free poles
ⓘ
high atmospheric CO2 levels ⓘ |
| duration | approximately 79 million years ⓘ |
| endedWith |
Cretaceous
self-linksurface differs
ⓘ
surface form:
Cretaceous–Paleogene extinction event
mass extinction about 66 million years ago ⓘ |
| endTime | approximately 66 million years ago ⓘ |
| followedBy | Paleogene ⓘ |
| follows | Jurassic ⓘ |
| geochronologicalRank | period ⓘ |
| hasBoundaryEvent |
Cretaceous–Paleogene boundary
ⓘ
Jurassic ⓘ
surface form:
Jurassic–Cretaceous boundary
|
| hasSubdivision |
Early Cretaceous
ⓘ
Late Cretaceous ⓘ |
| nameOrigin | Latin word "creta" meaning chalk ⓘ |
| notableFor |
diversification of birds
ⓘ
diversification of mammals ⓘ extinction of non-avian dinosaurs ⓘ large flying reptiles such as pterosaurs ⓘ large marine reptiles such as mosasaurs and plesiosaurs ⓘ rise of angiosperms ⓘ |
| paleogeography |
continued separation of Gondwana
ⓘ
development of modern ocean basins ⓘ opening of the South Atlantic Ocean ⓘ |
| partOf |
Mesozoic Era
ⓘ
Mesozoic Era time scale ⓘ Phanerozoic Eon ⓘ |
| precededBy | Jurassic Period ⓘ |
| startTime | approximately 145 million years ago ⓘ |
| succeededBy |
Paleogene
ⓘ
surface form:
Paleogene Period
|
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: Cretaceous Description of subject: 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.
Referenced by (53)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Cretaceous period