Emsian–Eifelian boundary
E538406
The Emsian–Eifelian boundary marks the internationally recognized transition between the Early and Middle Devonian periods in the geologic timescale.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Emsian–Eifelian boundary canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5631650 — 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: Emsian–Eifelian boundary Context triple: [Middle Devonian, startBoundary, Emsian–Eifelian boundary]
-
A.
Furongian
Furongian is the late epoch of the Cambrian Period, marking the final stage of early Paleozoic marine life diversification before the Ordovician.
-
B.
Late Devonian
The Late Devonian was the final epoch of the Devonian Period, marked by extensive reef collapse, major evolutionary changes in fish and early land plants, and several significant mass extinction events.
-
C.
Late Ordovician
The Late Ordovician was the final subdivision of the Ordovician Period, marked by extensive marine biodiversity followed by one of the largest mass extinction events in Earth's history.
-
D.
Cisuralian Epoch
The Cisuralian Epoch is the earliest subdivision of the Permian, marking a time of significant diversification of terrestrial life and continued development of early amniotes following the late Paleozoic ice age.
-
E.
Hettangian stage
The Hettangian stage is the earliest age of the Jurassic Period, marking the beginning of the Mesozoic era’s Jurassic system in the geologic time scale.
- 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: Emsian–Eifelian boundary Target entity description: The Emsian–Eifelian boundary marks the internationally recognized transition between the Early and Middle Devonian periods in the geologic timescale.
-
A.
Furongian
Furongian is the late epoch of the Cambrian Period, marking the final stage of early Paleozoic marine life diversification before the Ordovician.
-
B.
Late Devonian
The Late Devonian was the final epoch of the Devonian Period, marked by extensive reef collapse, major evolutionary changes in fish and early land plants, and several significant mass extinction events.
-
C.
Late Ordovician
The Late Ordovician was the final subdivision of the Ordovician Period, marked by extensive marine biodiversity followed by one of the largest mass extinction events in Earth's history.
-
D.
Cisuralian Epoch
The Cisuralian Epoch is the earliest subdivision of the Permian, marking a time of significant diversification of terrestrial life and continued development of early amniotes following the late Paleozoic ice age.
-
E.
Hettangian stage
The Hettangian stage is the earliest age of the Jurassic Period, marking the beginning of the Mesozoic era’s Jurassic system in the geologic time scale.
- F. None of above. chosen
Statements (25)
| Predicate | Object |
|---|---|
| instanceOf |
chronostratigraphic boundary
ⓘ
stage boundary ⓘ |
| belongsTo |
Paleozoic Era
ⓘ
Phanerozoic Eon ⓘ |
| chronologicRank | stage boundary within system ⓘ |
| definedBy | International Commission on Stratigraphy ⓘ |
| follows | Emsian Stage ⓘ |
| geologicPeriod | Devonian ⓘ |
| hasTemporalContext | Middle Paleozoic ⓘ |
| isBoundaryBetween | Devonian stages ⓘ |
| isReferenceFor | correlation of Devonian strata ⓘ |
| marksTransitionBetween |
Early Devonian
ⓘ
Middle Devonian ⓘ |
| partOf |
Devonian System
ⓘ
linked to:
Devonian Period
|
| positionInTimeScale | boundary between Early and Middle Devonian ⓘ |
| precedes | Eifelian Stage ⓘ |
| recognizedBy | International Union of Geological Sciences ⓘ |
| separates |
Eifelian Stage
ⓘ
Emsian Stage ⓘ |
| standardizedAs | Global boundary in the International Chronostratigraphic Chart ⓘ |
| timeScaleType | global standard chronostratigraphic scale ⓘ |
| usedIn |
geochronology
ⓘ
geologic time scale ⓘ paleontology ⓘ 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: Emsian–Eifelian boundary Description of subject: The Emsian–Eifelian boundary marks the internationally recognized transition between the Early and Middle Devonian periods in the geologic timescale.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.