Lomagundi excursion
E843364
The Lomagundi excursion is a major Paleoproterozoic carbon isotope anomaly reflecting a prolonged global increase in organic carbon burial and atmospheric oxygen levels.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Lomagundi excursion canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T10138359 — 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: Lomagundi excursion Context triple: [Lomagundi–Jatuli carbon isotope excursion, alsoKnownAs, Lomagundi excursion]
-
A.
Northern Trek
Northern Trek is a cold-climate themed exhibit at Cleveland Metroparks Zoo featuring animals adapted to northern and Arctic environments.
-
B.
Tamina Gorge trail
The Tamina Gorge trail is a scenic hiking path in Switzerland that leads visitors through a narrow, dramatic ravine carved by the Tamina River, featuring steep rock walls and thermal springs.
-
C.
Tundra Trek
Tundra Trek is a themed exhibit area at the Toronto Zoo that showcases Arctic wildlife and habitats, featuring animals such as polar bears, reindeer, and Arctic wolves.
-
D.
The Valley of Adventure
The Valley of Adventure is a children's adventure novel by Enid Blyton, featuring the recurring group of young protagonists who uncover mystery and danger in a remote, mountainous valley.
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E.
Karloo Track
Karloo Track is a popular bushwalking trail in New South Wales, Australia, known for its scenic sandstone landscapes, native bushland, and access to natural swimming spots like Karloo Pool.
- 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: Lomagundi excursion Target entity description: The Lomagundi excursion is a major Paleoproterozoic carbon isotope anomaly reflecting a prolonged global increase in organic carbon burial and atmospheric oxygen levels.
-
A.
Northern Trek
Northern Trek is a cold-climate themed exhibit at Cleveland Metroparks Zoo featuring animals adapted to northern and Arctic environments.
-
B.
Tamina Gorge trail
The Tamina Gorge trail is a scenic hiking path in Switzerland that leads visitors through a narrow, dramatic ravine carved by the Tamina River, featuring steep rock walls and thermal springs.
-
C.
Tundra Trek
Tundra Trek is a themed exhibit area at the Toronto Zoo that showcases Arctic wildlife and habitats, featuring animals such as polar bears, reindeer, and Arctic wolves.
-
D.
The Valley of Adventure
The Valley of Adventure is a children's adventure novel by Enid Blyton, featuring the recurring group of young protagonists who uncover mystery and danger in a remote, mountainous valley.
-
E.
Karloo Track
Karloo Track is a popular bushwalking trail in New South Wales, Australia, known for its scenic sandstone landscapes, native bushland, and access to natural swimming spots like Karloo Pool.
- F. None of above. chosen
Statements (43)
| Predicate | Object |
|---|---|
| instanceOf |
Paleoproterozoic geological event
ⓘ
carbon isotope anomaly ⓘ carbon isotope excursion ⓘ |
| affects |
atmospheric oxygen concentration
ⓘ
global carbon cycle ⓘ redox state of the oceans ⓘ |
| associatedWith | Great Oxidation Event ⓘ |
| characterizedBy |
elevated atmospheric oxygen levels
ⓘ
global-scale positive δ13C anomaly ⓘ large positive carbon isotope values in marine carbonates ⓘ prolonged increase in organic carbon burial ⓘ |
| duration | on the order of 100 million years or more ⓘ |
| endTime | approximately 2.06 billion years ago ⓘ |
| evidenceType |
carbon isotope ratios in marine carbonate rocks
ⓘ
δ13C measurements of carbonate and organic carbon ⓘ |
| follows | initial rise of atmospheric oxygen in the Great Oxidation Event ⓘ |
| geologicalAge |
Paleoproterozoic Eon
ⓘ
linked to:
Paleoproterozoic Era
|
| hasConsequence |
long-term shift in surface environment redox conditions
ⓘ
possible expansion of habitable niches for early life ⓘ |
| hasMagnitude | δ13Ccarb values commonly exceeding +10‰ ⓘ |
| interpretedAs |
evidence for large-scale organic carbon sequestration
ⓘ
interval of enhanced net oxygen production ⓘ |
| linkedToProcess |
enhanced burial of organic carbon in sediments
ⓘ
long-term oxygen accumulation in the atmosphere-ocean system ⓘ oxidation of reduced volcanic and crustal gases ⓘ |
| namedAfter | Lomagundi region in Zimbabwe ⓘ |
| recordedIn |
Lomagundi Group of Zimbabwe
ⓘ
linked to:
Lomagundi region in Zimbabwe
Paleoproterozoic sedimentary basins ⓘ |
| relatedConcept |
Earth oxygenation events
ⓘ
carbon isotope stratigraphy ⓘ organic carbon burial feedbacks ⓘ |
| relevance |
constrains timing of atmospheric oxygenation
ⓘ
informs models of early Earth habitability ⓘ used to calibrate Paleoproterozoic stratigraphy ⓘ |
| spatialExtent | global ⓘ |
| startTime | approximately 2.22 billion years ago ⓘ |
| studiedInDiscipline |
geochemistry
ⓘ
paleoclimatology ⓘ sedimentary geology ⓘ |
| temporalRelation |
postdates onset of the Great Oxidation Event
ⓘ
precedes later Paleoproterozoic decline in δ13C values ⓘ |
| uncertainty |
exact duration is debated
ⓘ
mechanisms driving the anomaly are debated ⓘ |
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: Lomagundi excursion Description of subject: The Lomagundi excursion is a major Paleoproterozoic carbon isotope anomaly reflecting a prolonged global increase in organic carbon burial and atmospheric oxygen levels.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.