Imbrian period
E867322
The Imbrian period is a major lunar geologic era characterized by extensive mare volcanism and large impact basins that shaped much of the Moon’s visible surface.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Imbrian period canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T10501589 — 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: Imbrian period Context triple: [Mare Imbrium, age, Imbrian period]
-
A.
Siderian Period
The Siderian Period is the earliest division of the Paleoproterozoic, marked by widespread banded iron formation deposition and the initial rise of atmospheric oxygen on Earth.
-
B.
Terreneuvian
The Terreneuvian is the earliest age of the Cambrian Period, marking the beginning of the Phanerozoic Eon and the widespread appearance of complex animal life in the fossil record.
-
C.
Cisuralian Epoch
The Cisuralian Epoch is the earliest subdivision of the Permian, marking a time of significant diversification of terrestrial life and continued development of early amniotes following the late Paleozoic ice age.
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D.
Cryogenian Period
The Cryogenian Period was a geologic interval roughly 720–635 million years ago marked by some of the most extreme global glaciations in Earth’s history, when ice may have covered much of the planet.
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E.
Rhyacian Period
The Rhyacian Period is a geologic time interval in the early Proterozoic characterized by significant crustal growth, widespread metamorphism, and some of the earliest known large-scale glaciations.
- 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: Imbrian period Target entity description: The Imbrian period is a major lunar geologic era characterized by extensive mare volcanism and large impact basins that shaped much of the Moon’s visible surface.
-
A.
Siderian Period
The Siderian Period is the earliest division of the Paleoproterozoic, marked by widespread banded iron formation deposition and the initial rise of atmospheric oxygen on Earth.
-
B.
Terreneuvian
The Terreneuvian is the earliest age of the Cambrian Period, marking the beginning of the Phanerozoic Eon and the widespread appearance of complex animal life in the fossil record.
-
C.
Cisuralian Epoch
The Cisuralian Epoch is the earliest subdivision of the Permian, marking a time of significant diversification of terrestrial life and continued development of early amniotes following the late Paleozoic ice age.
-
D.
Cryogenian Period
The Cryogenian Period was a geologic interval roughly 720–635 million years ago marked by some of the most extreme global glaciations in Earth’s history, when ice may have covered much of the planet.
-
E.
Rhyacian Period
The Rhyacian Period is a geologic time interval in the early Proterozoic characterized by significant crustal growth, widespread metamorphism, and some of the earliest known large-scale glaciations.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
lunar geologic era
ⓘ
lunar geologic period ⓘ |
| associatedWith |
Imbrium basin formation
NERFINISHED
ⓘ
Orientale basin formation NERFINISHED ⓘ |
| characterizedBy |
extensive mare volcanism
ⓘ
formation of large impact basins ⓘ widespread basaltic lava flooding ⓘ |
| correlatesWith | heavy bombardment tail end in inner Solar System ⓘ |
| definedBy |
lunar impact stratigraphy
ⓘ
radiometric age dating of lunar samples ⓘ |
| distinguishedFrom |
Copernican period
ⓘ
Eratosthenian period NERFINISHED ⓘ Nectarian period NERFINISHED ⓘ Pre-Nectarian period ⓘ |
| EarlyImbrianApproximateAgeRange | 3.85–3.8 billion years ago ⓘ |
| evidenceFrom |
Apollo mission rock samples
ⓘ
lunar meteorites ⓘ |
| follows | Nectarian period NERFINISHED ⓘ |
| hasApproximateEndAge | 3.2 billion years ago ⓘ |
| hasApproximateStartAge | 3.85 billion years ago ⓘ |
| hasImpactCrateringActivity | declining compared to earlier periods ⓘ |
| hasKeyBasin |
Crisium basin
NERFINISHED
ⓘ
Humorum basin NERFINISHED ⓘ Imbrium basin NERFINISHED ⓘ Nubium basin NERFINISHED ⓘ Orientale basin NERFINISHED ⓘ Serenitatis basin NERFINISHED ⓘ Tranquillitatis basin NERFINISHED ⓘ |
| hasSubdivision |
Early Imbrian
NERFINISHED
ⓘ
Late Imbrian ⓘ |
| hasVolcanicActivity | peak mare basalt eruptions ⓘ |
| includesEvent |
formation of Mare Imbrium
ⓘ
formation of major lunar maria ⓘ |
| includesTerrainType |
mare plains
GENERATED
ⓘ
ringed impact basins GENERATED ⓘ |
| LateImbrianApproximateAgeRange | 3.8–3.2 billion years ago ⓘ |
| mappedUsing | lunar orbital imagery ⓘ |
| namedAfter | Mare Imbrium NERFINISHED ⓘ |
| occursOn | Moon NERFINISHED ⓘ |
| partOf | geologic history of the Moon ⓘ |
| precedes | Eratosthenian period NERFINISHED ⓘ |
| recognizedBy | International Commission on Stratigraphy for the Moon NERFINISHED ⓘ |
| shaped | much of the Moon’s visible surface ⓘ |
| startAfter | Nectaris basin formation NERFINISHED ⓘ |
| usedIn | lunar stratigraphic classification ⓘ |
| visibleOn | near side of the Moon ⓘ |
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: Imbrian period Description of subject: The Imbrian period is a major lunar geologic era characterized by extensive mare volcanism and large impact basins that shaped much of the Moon’s visible surface.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.