Paleoarchean Era
E226440
The Paleoarchean Era is an early division of Earth's geologic history marked by the stabilization of the first continental crust and the emergence of some of the oldest known life forms.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Paleoarchean Era canonical | 4 |
| Paleoarchean era | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1966305 — 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: Paleoarchean Era Context triple: [Precambrian Supereon, contains, Paleoarchean Era]
-
A.
Archean Eon
The Archean Eon is an ancient geological eon of Earth's history, spanning from about 4.0 to 2.5 billion years ago, characterized by the formation of the first stable continental crust and the earliest known life.
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B.
Paleoproterozoic Era
The Paleoproterozoic Era was an early division of Earth's history marked by the stabilization of continental cratons, widespread banded iron formations, and the Great Oxidation Event that significantly increased atmospheric oxygen.
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C.
Precambrian Supereon
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.
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D.
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.
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E.
Mesoproterozoic Era
The Mesoproterozoic Era was a middle division of Earth's Proterozoic Eon characterized by the stabilization of continental cratons, widespread sedimentary basin development, and significant evolutionary advances in eukaryotic life.
- 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: Paleoarchean Era Target entity description: The Paleoarchean Era is an early division of Earth's geologic history marked by the stabilization of the first continental crust and the emergence of some of the oldest known life forms.
-
A.
Archean Eon
The Archean Eon is an ancient geological eon of Earth's history, spanning from about 4.0 to 2.5 billion years ago, characterized by the formation of the first stable continental crust and the earliest known life.
-
B.
Paleoproterozoic Era
The Paleoproterozoic Era was an early division of Earth's history marked by the stabilization of continental cratons, widespread banded iron formations, and the Great Oxidation Event that significantly increased atmospheric oxygen.
-
C.
Precambrian Supereon
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.
-
D.
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.
-
E.
Mesoproterozoic Era
The Mesoproterozoic Era was a middle division of Earth's Proterozoic Eon characterized by the stabilization of continental cratons, widespread sedimentary basin development, and significant evolutionary advances in eukaryotic life.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
Archean era
ⓘ
geologic era ⓘ |
| associatedWith |
early plate tectonic activity or proto-plate tectonics
ⓘ
formation of early oceanic crust ⓘ growth of early continental crust ⓘ |
| characterizedBy |
anoxic atmosphere
ⓘ
development of early continental nuclei ⓘ emergence of some of the oldest known life forms ⓘ formation of some of the first stable cratons ⓘ greenhouse atmosphere dominated by CO2 and other gases ⓘ high heat flow from Earth’s interior ⓘ intense volcanic activity ⓘ lack of free molecular oxygen in the atmosphere ⓘ presence of early microbial life ⓘ rapid tectonic processes compared with later eons ⓘ stabilization of early continental crust ⓘ warm surface temperatures ⓘ |
| chronostratigraphicRank | era ⓘ |
| contains |
some of the oldest known microfossils
ⓘ
some of the oldest known sedimentary rocks ⓘ some of the oldest known stromatolites ⓘ |
| definedBy | absolute age boundaries rather than global stratotype section ⓘ |
| endTime |
3.2 Ga
ⓘ
about 3.2 billion years ago ⓘ |
| environmentalCondition |
largely ice-free oceans despite lower solar output
ⓘ
reduced solar luminosity compared with present ⓘ strong greenhouse effect compensating for faint young Sun ⓘ |
| follows | Eoarchean Era ⓘ |
| geologicTimeScaleUsedBy | International Commission on Stratigraphy ⓘ |
| hasGlobalContext |
Earth’s surface dominated by oceans with small protocontinents
ⓘ
high meteorite impact rate relative to later eons ⓘ |
| importance |
records early evolution of Earth’s biosphere
ⓘ
records early evolution of Earth’s crust ⓘ |
| lifeEvidenceType |
carbon isotopic signatures consistent with biological activity
ⓘ
microbial mat structures ⓘ stromatolitic structures ⓘ |
| lifeForms |
archaea-like organisms
ⓘ
bacteria-like organisms ⓘ prokaryotic microorganisms ⓘ |
| partOf | Archean Eon ⓘ |
| positionInArchean | earliest formally recognized era after the Eoarchean ⓘ |
| precededBy | Hadean Eon in broader Earth history ⓘ |
| precedes | Mesoarchean Era ⓘ |
| startTime |
3.6 Ga
ⓘ
about 3.6 billion years ago ⓘ |
| tectonicStyle |
frequent crustal recycling
ⓘ
possibly dominated by smaller, more mobile plates ⓘ |
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: Paleoarchean Era Description of subject: The Paleoarchean Era is an early division of Earth's geologic history marked by the stabilization of the first continental crust and the emergence of some of the oldest known life forms.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Paleoarchean Era