Stenian Period
E232461
The Stenian Period is the final division of the Mesoproterozoic Era, marked by the assembly of the supercontinent Rodinia and significant geological and tectonic activity roughly 1.2 to 1.0 billion years ago.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Stenian Period canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T2087569 — 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: Stenian Period Context triple: [Mesoproterozoic Era, contains, Stenian Period]
-
A.
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.
-
B.
Statherian Period
The Statherian Period is the final division of the Paleoproterozoic Era, marked by the stabilization of continental cratons and significant crustal growth roughly 1.8 to 1.6 billion years ago.
-
C.
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.
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D.
Sturtian glaciation
The Sturtian glaciation was a major global ice age during the Neoproterozoic, when extensive ice sheets may have covered much of Earth’s surface in one of the most severe glacial events in the planet’s history.
-
E.
Pridoli Epoch
The Pridoli Epoch is the final epoch of the Silurian Period, marking a transitional interval in Earth’s history just before the onset of the Devonian.
- 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: Stenian Period Target entity description: The Stenian Period is the final division of the Mesoproterozoic Era, marked by the assembly of the supercontinent Rodinia and significant geological and tectonic activity roughly 1.2 to 1.0 billion years ago.
-
A.
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.
-
B.
Statherian Period
The Statherian Period is the final division of the Paleoproterozoic Era, marked by the stabilization of continental cratons and significant crustal growth roughly 1.8 to 1.6 billion years ago.
-
C.
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.
-
D.
Sturtian glaciation
The Sturtian glaciation was a major global ice age during the Neoproterozoic, when extensive ice sheets may have covered much of Earth’s surface in one of the most severe glacial events in the planet’s history.
-
E.
Pridoli Epoch
The Pridoli Epoch is the final epoch of the Silurian Period, marking a transitional interval in Earth’s history just before the onset of the Devonian.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
chronostratigraphic unit
ⓘ
geologic period ⓘ |
| approximateAgeRange | 1.2–1.0 Ga ⓘ |
| associatedWith | supercontinent Rodinia ⓘ |
| biologicalContext |
pre-Ediacaran microbial life dominated
ⓘ
stromatolite-forming microbial communities common ⓘ |
| boundaryDefinition | defined by absolute age rather than a specific stratotype ⓘ |
| chronologicalOrder | third period of the Mesoproterozoic ⓘ |
| chronometricDefinition | defined numerically in millions of years before present ⓘ |
| definedBy | International Commission on Stratigraphy ⓘ |
| definingCharacteristic |
assembly of the supercontinent Rodinia
ⓘ
narrow, elongate sedimentary basins ⓘ significant tectonic activity ⓘ |
| endTime |
1.0 billion years ago
ⓘ
1000 million years ago ⓘ |
| fallsWithin | Precambrian Supereon ⓘ |
| followedBy |
Neoproterozoic Era
ⓘ
surface form:
Tonian Period
|
| follows | Ectasian Period ⓘ |
| geologicContext | part of the Proterozoic tectonothermal evolution ⓘ |
| geologicEon | Proterozoic Eon ⓘ |
| geologicEra | Mesoproterozoic Era ⓘ |
| globalSignificance | key interval in Proterozoic supercontinent cycles ⓘ |
| lithosphericProcess | crustal growth and stabilization in many cratons ⓘ |
| magmaticActivity | widespread magmatism associated with orogenesis ⓘ |
| namedAfter | Greek word "stenos" (narrow) ⓘ |
| paleoclimate | generally warm Proterozoic climate conditions ⓘ |
| paleogeography |
development of large-scale mountain belts
ⓘ
growth and amalgamation of continental blocks ⓘ |
| partOf | Mesoproterozoic Era ⓘ |
| positionInEra | final period of the Mesoproterozoic ⓘ |
| precededBy | Ectasian Period ⓘ |
| precedes |
Neoproterozoic Era
ⓘ
surface form:
Tonian Period
|
| sedimentaryEnvironment | development of rift and basin systems ⓘ |
| sedimentaryRecord | extensive deposition in narrow basins ⓘ |
| standardStatus | ICS-recognized period ⓘ |
| startTime |
1.2 billion years ago
ⓘ
1200 million years ago ⓘ |
| stratigraphicRank | period ⓘ |
| supercontinentCycleStage | assembly phase of Rodinia ⓘ |
| tectonicActivity |
continental collision related to Rodinia assembly
ⓘ
widespread orogenic events ⓘ |
| temporalPlacement | late Mesoproterozoic ⓘ |
| timeSpan | approximately 200 million years ⓘ |
| usedIn |
geologic time scale
ⓘ
stratigraphic correlation of Proterozoic rocks ⓘ |
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: Stenian Period Description of subject: The Stenian Period is the final division of the Mesoproterozoic Era, marked by the assembly of the supercontinent Rodinia and significant geological and tectonic activity roughly 1.2 to 1.0 billion years ago.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.