Mesoarchean Era
E234966
The Mesoarchean Era is a division of early Earth history, roughly 3.2 to 2.8 billion years ago, marked by the stabilization of continental crust and the continued evolution of early life.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Mesoarchean Era canonical | 4 |
How this entity was disambiguated
This entity first appeared as the object of triple T1966304 — 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: Mesoarchean Era Context triple: [Precambrian Supereon, contains, Mesoarchean Era]
-
A.
Paleoarchean Era
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.
-
B.
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.
-
C.
Eoarchean Era
The Eoarchean Era is an ancient division of Earth's early history marked by the formation of the first stable continental crust and some of the oldest known rocks and possible signs of early life.
-
D.
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.
-
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: Mesoarchean Era Target entity description: The Mesoarchean Era is a division of early Earth history, roughly 3.2 to 2.8 billion years ago, marked by the stabilization of continental crust and the continued evolution of early life.
-
A.
Paleoarchean Era
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.
-
B.
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.
-
C.
Eoarchean Era
The Eoarchean Era is an ancient division of Earth's early history marked by the formation of the first stable continental crust and some of the oldest known rocks and possible signs of early life.
-
D.
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.
-
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 subdivision
ⓘ
geologic era ⓘ |
| associatedWith |
early oxygenic photosynthesis
ⓘ
low but increasing atmospheric oxygen levels locally ⓘ |
| atmosphericState | largely oxygen-poor atmosphere ⓘ |
| biosignaturesInclude |
carbon isotope fractionation indicative of biological activity
ⓘ
stromatolitic carbonates ⓘ |
| biosphereDominatedBy | prokaryotic microorganisms ⓘ |
| characterizedBy |
anoxic atmosphere
ⓘ
continued evolution of early life ⓘ development of more stable cratons ⓘ greenstone belt formation ⓘ growth of continental nuclei ⓘ high heat flow from Earth’s interior ⓘ microbial life dominance ⓘ photosynthetic microbial communities ⓘ significant volcanic activity ⓘ stabilization of continental crust ⓘ stromatolite development ⓘ |
| climate |
faint young Sun conditions
ⓘ
likely greenhouse-gas-rich atmosphere ⓘ |
| definedBy |
International Commission on Stratigraphy
ⓘ
surface form:
International Commission on Stratigraphy (conceptually, though not formally ratified as a chronostratigraphic unit)
|
| duration | approximately 400 million years ⓘ |
| endTime | 2.8 billion years ago ⓘ |
| environmentalConditions |
higher global heat flow than present day
ⓘ
hotter mantle than present day ⓘ lack of complex multicellular life ⓘ |
| followedBy | Neoarchean Era ⓘ |
| follows | Paleoarchean Era ⓘ |
| geologicSignificance |
important for formation of long-lived cratonic blocks
ⓘ
major phase of continental crust stabilization ⓘ |
| hasRepresentativeCratons |
Kaapvaal Craton
ⓘ
Pilbara Craton ⓘ Superior craton ⓘ
surface form:
Superior Craton (older parts)
|
| hydrosphereState | presence of liquid water oceans ⓘ |
| lifeEvolutionStage | early diversification of microbial ecosystems ⓘ |
| partOf | Archean Eon ⓘ |
| positionInArchean | third era of the Archean Eon ⓘ |
| precededBy | early Archean crustal growth phases ⓘ |
| rockRecordIncludes |
banded iron formations
ⓘ
komatiitic lavas ⓘ tonalite–trondhjemite–granodiorite suites ⓘ |
| startTime | 3.2 billion years ago ⓘ |
| succeededBy | further continental stabilization in the Neoarchean ⓘ |
| temporalRelationToEarthFormation | about 1.3 to 1.7 billion years after Earth formed ⓘ |
| timeScaleCategory | Precambrian geologic time division ⓘ |
| usedIn |
Precambrian Supereon
ⓘ
surface form:
Precambrian time scale
|
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: Mesoarchean Era Description of subject: The Mesoarchean Era is a division of early Earth history, roughly 3.2 to 2.8 billion years ago, marked by the stabilization of continental crust and the continued evolution of early life.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.