Eocene
E792421
The Eocene was a geologic epoch, roughly 56 to 34 million years ago, marked by warm global climates and significant diversification of early mammals and modern plant groups.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Eocene canonical | 7 |
| Eocene Epoch | 2 |
| Eocene epoch | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T9287211 — 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: Eocene Context triple: [Xiphodontidae, firstAppearance, Eocene]
-
A.
Oligocene Epoch
The Oligocene Epoch was a geologic time interval roughly 34 to 23 million years ago marked by global cooling, the expansion of grasslands, and significant evolution and diversification of mammals.
-
B.
Paleocene
The Paleocene was an early Cenozoic epoch, roughly 66–56 million years ago, marked by the recovery of life after the dinosaur-extinction event and the rapid diversification of mammals.
-
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.
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.
-
E.
Miocene
The Miocene is a geologic epoch of the Neogene Period characterized by significant global cooling, expansion of grasslands, and diversification of mammals and early apes.
- 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: Eocene Target entity description: The Eocene was a geologic epoch, roughly 56 to 34 million years ago, marked by warm global climates and significant diversification of early mammals and modern plant groups.
-
A.
Oligocene Epoch
The Oligocene Epoch was a geologic time interval roughly 34 to 23 million years ago marked by global cooling, the expansion of grasslands, and significant evolution and diversification of mammals.
-
B.
Paleocene
The Paleocene was an early Cenozoic epoch, roughly 66–56 million years ago, marked by the recovery of life after the dinosaur-extinction event and the rapid diversification of mammals.
-
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.
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.
-
E.
Miocene
The Miocene is a geologic epoch of the Neogene Period characterized by significant global cooling, expansion of grasslands, and diversification of mammals and early apes.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf | geologic epoch ⓘ |
| associatedWith |
active plate tectonics and mountain building
ⓘ
collision of India with Asia ⓘ continued opening of the North Atlantic Ocean ⓘ development of many modern plant families ⓘ diversification of bats ⓘ diversification of early horses ⓘ diversification of early whales (archaeocetes) ⓘ diversification of rodents ⓘ early stages of Himalayan uplift ⓘ expansion of angiosperm-dominated forests ⓘ formation of the Drake Passage region ⓘ high sea levels ⓘ initial diversification of many modern mammal orders ⓘ radiation of early primates ⓘ widespread peat and coal formation in some regions ⓘ |
| characterizedBy |
absence of large continental ice sheets for most of epoch
ⓘ
expansion of modern plant groups ⓘ greenhouse climate state ⓘ high atmospheric CO2 levels ⓘ significant diversification of early mammals ⓘ warm global climates ⓘ warm high-latitude climates ⓘ widespread tropical and subtropical forests ⓘ |
| chronostratigraphicUnit | Eocene Series NERFINISHED ⓘ |
| endTime |
Priabonian age close
ⓘ
approximately 34 million years ago ⓘ |
| etymology | from Greek eos meaning dawn ⓘ |
| followedBy | Oligocene NERFINISHED ⓘ |
| follows | Paleocene ⓘ |
| geochronologicUnit | Eocene Epoch NERFINISHED ⓘ |
| hasStratotypeRegion | northwestern Europe ⓘ |
| hasSubdivision |
Bartonian
NERFINISHED
ⓘ
Lutetian NERFINISHED ⓘ Priabonian NERFINISHED ⓘ Ypresian NERFINISHED ⓘ |
| includesEvent |
Early Eocene Climatic Optimum
NERFINISHED
ⓘ
Eocene–Oligocene transition cooling NERFINISHED ⓘ Middle Eocene Climatic Optimum NERFINISHED ⓘ Paleocene–Eocene Thermal Maximum recovery phase NERFINISHED ⓘ |
| namedBy | Charles Lyell NERFINISHED ⓘ |
| partOf | Paleogene Period NERFINISHED ⓘ |
| precededBy | Paleocene NERFINISHED ⓘ |
| precedes | Oligocene NERFINISHED ⓘ |
| startTime |
Ypresian age onset
ⓘ
approximately 56 million years ago ⓘ |
| subdivisionOf |
Cenozoic Era
NERFINISHED
ⓘ
Phanerozoic Eon NERFINISHED ⓘ |
| usedIn | International Commission on Stratigraphy timescale NERFINISHED ⓘ |
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: Eocene Description of subject: The Eocene was a geologic epoch, roughly 56 to 34 million years ago, marked by warm global climates and significant diversification of early mammals and modern plant groups.
Referenced by (10)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Eocene Epoch
this entity surface form:
Eocene epoch
this entity surface form:
Eocene Epoch