Precambrian Supereon
E42694
The Precambrian Supereon is the vast span of Earth's early history before the Phanerozoic, encompassing the Hadean, Archean, and Proterozoic eons during which the planet formed, life first appeared, and early continents and atmospheres developed.
All labels observed (8)
| Label | Occurrences |
|---|---|
| Precambrian | 34 |
| Precambrian Supereon canonical | 10 |
| Precambrian Eon | 3 |
| Precambrian geology | 1 |
| Precambrian or early Cambrian | 1 |
| Precambrian stratigraphy | 1 |
| Precambrian time | 1 |
| Precambrian time scale | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T335895 — 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: Precambrian Supereon Context triple: [Proterozoic Eon, partOf, Precambrian Supereon]
-
A.
Proterozoic Eon
The Proterozoic Eon is a major division of Precambrian time, spanning from about 2.5 billion to 541 million years ago, marked by the buildup of atmospheric oxygen, the emergence of complex single-celled and early multicellular life, and the assembly of large continental landmasses.
-
B.
Paleozoic Era
The Paleozoic Era was an ancient geologic time interval, spanning roughly 541 to 252 million years ago, marked by the emergence and diversification of complex life in the seas and on land and the assembly of major continental landmasses.
-
C.
Phanerozoic Eon
The Phanerozoic Eon is the current and most recent major division of Earth's history, marked by abundant fossil evidence and the evolution and diversification of complex life forms, including plants, animals, and eventually humans.
-
D.
Early Devonian
The Early Devonian was the initial subdivision of the Devonian Period, marked by the diversification of early fishes and the spread of primitive vascular land plants across emerging terrestrial ecosystems.
-
E.
Jurassic Period
The Jurassic Period was a major division of the Mesozoic Era characterized by warm climates, the dominance and diversification of dinosaurs, and the early evolution of birds.
- 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: Precambrian Supereon Target entity description: The Precambrian Supereon is the vast span of Earth's early history before the Phanerozoic, encompassing the Hadean, Archean, and Proterozoic eons during which the planet formed, life first appeared, and early continents and atmospheres developed.
-
A.
Proterozoic Eon
The Proterozoic Eon is a major division of Precambrian time, spanning from about 2.5 billion to 541 million years ago, marked by the buildup of atmospheric oxygen, the emergence of complex single-celled and early multicellular life, and the assembly of large continental landmasses.
-
B.
Paleozoic Era
The Paleozoic Era was an ancient geologic time interval, spanning roughly 541 to 252 million years ago, marked by the emergence and diversification of complex life in the seas and on land and the assembly of major continental landmasses.
-
C.
Phanerozoic Eon
The Phanerozoic Eon is the current and most recent major division of Earth's history, marked by abundant fossil evidence and the evolution and diversification of complex life forms, including plants, animals, and eventually humans.
-
D.
Early Devonian
The Early Devonian was the initial subdivision of the Devonian Period, marked by the diversification of early fishes and the spread of primitive vascular land plants across emerging terrestrial ecosystems.
-
E.
Jurassic Period
The Jurassic Period was a major division of the Mesozoic Era characterized by warm climates, the dominance and diversification of dinosaurs, and the early evolution of birds.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
geological time interval
ⓘ
supereon ⓘ |
| alsoKnownAs |
Cryptozoic
ⓘ
Precambrian Supereon ⓘ
surface form:
Precambrian
|
| boundaryDefinedBy | base of Cambrian Period at 541 Ma ⓘ |
| characterizedBy |
Great Oxidation Event
ⓘ
appearance of eukaryotes ⓘ appearance of multicellular organisms ⓘ dominance of microbial life ⓘ lack of abundant shelly fossils ⓘ major crustal differentiation ⓘ oxygenation of atmosphere ⓘ scarce fossil record ⓘ stabilization of continental cratons ⓘ |
| contains |
Neoproterozoic Era
ⓘ
surface form:
Cryogenian Period
Neoproterozoic Era ⓘ
surface form:
Ediacaran Period
Eoarchean Era ⓘ Hadean time interval ⓘ Mesoarchean Era ⓘ Mesoproterozoic Era ⓘ Archean Eon ⓘ
surface form:
Neoarchean Era
Neoproterozoic Era ⓘ Paleoarchean Era ⓘ Paleoproterozoic Era ⓘ |
| covers |
development of early atmosphere
ⓘ
development of early oceans ⓘ early Earth history ⓘ evolution of early life ⓘ formation of Earth ⓘ formation of first continents ⓘ origin of life ⓘ |
| duration | about 4 billion years ⓘ |
| endTime | about 541 million years ago ⓘ |
| followedBy |
Paleozoic Era
ⓘ
surface form:
Paleozoic Era (within Phanerozoic)
|
| follows | none (represents earliest Earth history) ⓘ |
| geologicTimeRank | supereon (largest formal division) ⓘ |
| includes |
Archean Eon
ⓘ
Hadean Eon ⓘ Proterozoic Eon ⓘ |
| includesEvent |
Snowball Earth glaciations
ⓘ
emergence of Ediacaran biota ⓘ formation of banded iron formations ⓘ formation of first stable continental crust ⓘ |
| location | Earth ⓘ |
| partOf | geologic time scale ⓘ |
| precededBy | no earlier formal eon ⓘ |
| precedes | Phanerozoic Eon ⓘ |
| significance | covers about 88 percent of Earth history ⓘ |
| startTime | about 4.6 billion years ago ⓘ |
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: Precambrian Supereon Description of subject: The Precambrian Supereon is the vast span of Earth's early history before the Phanerozoic, encompassing the Hadean, Archean, and Proterozoic eons during which the planet formed, life first appeared, and early continents and atmospheres developed.
Referenced by (52)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Precambrian or early Cambrian
this entity surface form:
Precambrian