Paleocene–Eocene Thermal Maximum
E905193
The Paleocene–Eocene Thermal Maximum was a brief, extreme global warming event about 56 million years ago marked by rapid temperature rise, massive carbon release, and major disruptions to Earth’s climate and ecosystems.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Late Paleocene Thermal Maximum | 1 |
| PETM | 1 |
| Paleocene–Eocene Thermal Maximum canonical | 1 |
| Paleocene–Eocene Thermal Maximum recovery phase | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11115116 — 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: Paleocene–Eocene Thermal Maximum Context triple: [Paleogene climatic optimums, hasComponent, Paleocene–Eocene Thermal Maximum]
-
A.
Lomagundi event
The Lomagundi event was a prolonged Paleoproterozoic episode of unusually high carbon isotope ratios in marine carbonates, interpreted as evidence for a major global increase in oxygen production and organic carbon burial.
-
B.
Permian–Triassic mass extinction
The Permian–Triassic mass extinction was the most severe biodiversity crisis in Earth's history, wiping out the majority of marine and terrestrial species around 252 million years ago and marking the boundary between the Paleozoic and Mesozoic eras.
-
C.
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.
-
D.
Toarcian Oceanic Anoxic Event
The Toarcian Oceanic Anoxic Event was a major Early Jurassic global environmental crisis marked by widespread marine oxygen depletion, significant carbon-cycle disruption, and associated mass extinctions.
-
E.
Younger Dryas cold event
The Younger Dryas cold event was a brief, abrupt return to near-glacial conditions about 12,900–11,700 years ago that interrupted the general warming trend at the end of the last Ice Age.
- 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: Paleocene–Eocene Thermal Maximum Target entity description: The Paleocene–Eocene Thermal Maximum was a brief, extreme global warming event about 56 million years ago marked by rapid temperature rise, massive carbon release, and major disruptions to Earth’s climate and ecosystems.
-
A.
Lomagundi event
The Lomagundi event was a prolonged Paleoproterozoic episode of unusually high carbon isotope ratios in marine carbonates, interpreted as evidence for a major global increase in oxygen production and organic carbon burial.
-
B.
Permian–Triassic mass extinction
The Permian–Triassic mass extinction was the most severe biodiversity crisis in Earth's history, wiping out the majority of marine and terrestrial species around 252 million years ago and marking the boundary between the Paleozoic and Mesozoic eras.
-
C.
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.
-
D.
Toarcian Oceanic Anoxic Event
The Toarcian Oceanic Anoxic Event was a major Early Jurassic global environmental crisis marked by widespread marine oxygen depletion, significant carbon-cycle disruption, and associated mass extinctions.
-
E.
Younger Dryas cold event
The Younger Dryas cold event was a brief, abrupt return to near-glacial conditions about 12,900–11,700 years ago that interrupted the general warming trend at the end of the last Ice Age.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
global warming event
ⓘ
hyperthermal event ⓘ paleoclimatic event ⓘ |
| affects |
atmosphere
ⓘ
cryosphere ⓘ marine ecosystems ⓘ terrestrial ecosystems ⓘ |
| associatedWith |
North Atlantic Igneous Province
ⓘ
linked to:
North Atlantic volcanic province
early evolution of modern mammal groups ⓘ migration of artiodactyls ⓘ migration of perissodactyls ⓘ migration of primates ⓘ |
| carbonReleaseMagnitude | thousands of gigatons of carbon ⓘ |
| characterizedBy |
global temperature increase of about 5–8 °C
ⓘ
rapid onset over a few thousand years ⓘ strong negative δ13C excursion ⓘ |
| duration | on the order of 100,000 to 200,000 years ⓘ |
| follows | Late Paleocene ⓘ |
| hasCause | massive carbon release ⓘ |
| hasEffect |
changes in ocean circulation
ⓘ
changes in terrestrial vegetation ⓘ deep-ocean warming ⓘ disruption of carbon cycle ⓘ dissolution of deep-sea carbonates ⓘ enhanced sediment delivery to oceans ⓘ extinctions of deep-sea benthic foraminifera ⓘ increased weathering rates ⓘ intensified hydrological cycle ⓘ mammalian dispersal and diversification ⓘ negative carbon isotope excursion ⓘ ocean acidification ⓘ poleward migration of many species ⓘ rapid global temperature rise ⓘ widespread biotic turnover ⓘ |
| location | global ⓘ |
| partOf |
Cenozoic Era
ⓘ
linked to:
Cenozoic
Paleogene Period ⓘ
linked to:
Paleogene
|
| possibleCause |
combination of multiple carbon sources
ⓘ
methane hydrate release ⓘ oxidation of organic carbon ⓘ volcanism associated with North Atlantic Igneous Province ⓘ |
| precedes |
Early Eocene Climatic Optimum
ⓘ
linked to:
Paleogene climatic optimums
|
| relevance |
analog for modern anthropogenic climate change
ⓘ
case study of rapid carbon cycle perturbation ⓘ |
| startTime | approximately 56 million years ago ⓘ |
| studiedUsing |
marine sediment cores
ⓘ
microfossil assemblages ⓘ stable isotope analysis ⓘ terrestrial sediment records ⓘ |
| temporalLocation | boundary between Paleocene and Eocene epochs ⓘ |
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: Paleocene–Eocene Thermal Maximum Description of subject: The Paleocene–Eocene Thermal Maximum was a brief, extreme global warming event about 56 million years ago marked by rapid temperature rise, massive carbon release, and major disruptions to Earth’s climate and ecosystems.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Paleocene–Eocene Thermal Maximum
linked to: Paleocene–Eocene Thermal Maximum
linked to: Paleocene–Eocene Thermal Maximum