Calymmian Period
E232459
The Calymmian Period is the earliest division of the Mesoproterozoic Era, marked by the stabilization and expansion of continental crust and the development of large sedimentary basins roughly 1.6 to 1.4 billion years ago.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Calymmian Period canonical | 4 |
How this entity was disambiguated
This entity first appeared as the object of triple T2087567 — 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: Calymmian Period Context triple: [Mesoproterozoic Era, contains, Calymmian Period]
-
A.
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.
-
B.
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.
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C.
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.
-
D.
Orosirian Period
The Orosirian Period is a division of early Earth's history marked by significant crustal stabilization, widespread orogeny, and major impact events roughly 2.05 to 1.8 billion years ago.
-
E.
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.
- 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: Calymmian Period Target entity description: The Calymmian Period is the earliest division of the Mesoproterozoic Era, marked by the stabilization and expansion of continental crust and the development of large sedimentary basins roughly 1.6 to 1.4 billion years ago.
-
A.
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.
-
B.
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.
-
C.
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.
-
D.
Orosirian Period
The Orosirian Period is a division of early Earth's history marked by significant crustal stabilization, widespread orogeny, and major impact events roughly 2.05 to 1.8 billion years ago.
-
E.
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.
- F. None of above. chosen
Statements (33)
| Predicate | Object |
|---|---|
| instanceOf |
chronostratigraphic unit
ⓘ
geologic period ⓘ |
| absoluteAgeBoundaries | defined numerically rather than by a specific stratotype ⓘ |
| approximateDurationMa | 200 ⓘ |
| characterizedBy |
development of large sedimentary basins
ⓘ
expansion of continental crust ⓘ extensive platform sedimentation ⓘ growth of stable cratons ⓘ rifting events in some cratonic regions ⓘ stabilization of continental crust ⓘ |
| chronologicalRank | period ⓘ |
| definedBy | International Commission on Stratigraphy ⓘ |
| endAgeMa | 1400 ⓘ |
| endTime |
1.4 billion years ago
ⓘ
1400 million years ago ⓘ |
| followedBy | continued Mesoproterozoic basin development ⓘ |
| follows | Statherian Period ⓘ |
| geologicEon | Proterozoic Eon ⓘ |
| geologicEra | Mesoproterozoic Era ⓘ |
| namedFor | development of extensive sedimentary cover sequences ⓘ |
| nameMeaning | calymma means "cover" or "veil" in Greek ⓘ |
| partOf | Mesoproterozoic Era ⓘ |
| positionInEra | earliest period of the Mesoproterozoic ⓘ |
| precededBy | Paleoproterozoic crustal evolution stages ⓘ |
| precedes | Ectasian Period ⓘ |
| startAgeMa | 1600 ⓘ |
| startTime |
1.6 billion years ago
ⓘ
1600 million years ago ⓘ |
| tectonicSetting | relative stabilization of many continental blocks ⓘ |
| timeSpan | 200 million years ⓘ |
| typicalDeposits |
continental margin sedimentary successions
ⓘ
thick shallow-marine sedimentary sequences ⓘ |
| usedIn |
International Chronostratigraphic Chart
ⓘ
surface form:
international geologic timescale
|
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: Calymmian Period Description of subject: The Calymmian Period is the earliest division of the Mesoproterozoic Era, marked by the stabilization and expansion of continental crust and the development of large sedimentary basins roughly 1.6 to 1.4 billion years ago.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.