Mesoproterozoic Era
E45387
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.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Mesoproterozoic Era canonical | 11 |
| Middle Proterozoic | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T335902 — 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: Mesoproterozoic Era Context triple: [Proterozoic Eon, subdivision, Mesoproterozoic Era]
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A.
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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B.
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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C.
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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D.
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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E.
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.
- 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: Mesoproterozoic Era Target entity description: 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.
-
A.
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.
-
B.
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.
-
C.
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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D.
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.
-
E.
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.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
geologic era
ⓘ
subdivision of the Proterozoic Eon ⓘ |
| associatedWith |
Grenville orogeny
ⓘ
continental collision events ⓘ growth of continental crust ⓘ |
| atmosphericCondition |
oxygen levels lower than modern atmosphere
ⓘ
relatively stable oxygen levels compared to Paleoproterozoic ⓘ |
| biologicalSignificance |
appearance of complex multicellular eukaryotes
ⓘ
development of more complex protistan ecosystems ⓘ diversification of eukaryotes ⓘ expansion of photosynthetic eukaryotic algae ⓘ |
| characterizedBy |
assembly of the supercontinent Rodinia
ⓘ
evolutionary advances in eukaryotic life ⓘ extensive platform cover sediments ⓘ large passive continental margins ⓘ rifting and breakup of earlier supercratons ⓘ stabilization of continental cratons ⓘ widespread sedimentary basin development ⓘ |
| chronostratigraphicUnit | Erathem ⓘ |
| climate |
absence of global-scale Snowball Earth glaciations
ⓘ
generally warm climate ⓘ |
| contains |
Calymmian Period
ⓘ
Ectasian Period ⓘ Stenian Period ⓘ |
| definedBy | absolute age boundaries at 1600 Ma and 1000 Ma ⓘ |
| duration | approximately 600 million years ⓘ |
| economicSignificance |
deposition of important sediment-hosted mineral deposits
ⓘ
formation of some large iron and base metal deposits ⓘ |
| end | 1000 million years ago ⓘ |
| followedBy | Neoproterozoic Era ⓘ |
| follows | Paleoproterozoic Era ⓘ |
| geochronologicRank | era ⓘ |
| notableEvent |
early stages of Rodinia supercontinent assembly
ⓘ
onset and development of the Grenville orogenic cycle ⓘ stabilization of many shield areas ⓘ |
| paleogeography |
development of large shallow epicontinental seas
ⓘ
dominance of stable cratonic blocks ⓘ |
| partOf | Proterozoic Eon ⓘ |
| positionInPrecambrian |
middle era of the Proterozoic Eon
ⓘ
part of the Precambrian Supereon ⓘ |
| precededBy | Great Oxidation Event ⓘ |
| sedimentaryRecord |
abundant stromatolitic carbonates
ⓘ
extensive siliciclastic successions ⓘ large, long-lived basins ⓘ |
| start | 1600 million years ago ⓘ |
| timeScaleStandard | International Commission on Stratigraphy ⓘ |
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: Mesoproterozoic Era Description of subject: 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.
Referenced by (12)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Middle Proterozoic