Silurian–Devonian boundary worldwide
E1502799
UNEXPLORED
The Silurian–Devonian boundary worldwide marks a major geological time division approximately 419 million years ago, characterized by significant evolutionary and environmental changes recorded in rock strata across the globe.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Silurian–Devonian boundary worldwide canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T21808864 — 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: Silurian–Devonian boundary worldwide Context triple: [Klonk, isReferenceSectionFor, Silurian–Devonian boundary worldwide]
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A.
Global Boundary Stratotype Section and Point for base of Hettangian
The Global Boundary Stratotype Section and Point for the base of the Hettangian is the internationally agreed geological reference point that marks the formal beginning of the Jurassic Period and the Mesozoic era’s post-Triassic recovery interval.
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B.
Frasnian–Famennian boundary
The Frasnian–Famennian boundary marks a major Late Devonian mass extinction interval characterized by severe global environmental upheavals and widespread marine biodiversity loss.
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C.
Emsian–Eifelian boundary
The Emsian–Eifelian boundary marks the internationally recognized transition between the Early and Middle Devonian periods in the geologic timescale.
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D.
Global Boundary Stratotype Section and Point for the base of the Anisian
The Global Boundary Stratotype Section and Point for the base of the Anisian is the internationally agreed geological reference point that marks the beginning of the Anisian Stage and thus the formal onset of the Middle Triassic.
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E.
Givetian–Frasnian boundary
The Givetian–Frasnian boundary marks the internationally recognized stratigraphic transition between the Middle and Late Devonian periods, defined by specific fossil and sedimentary changes in the geologic record.
- 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: Silurian–Devonian boundary worldwide Target entity description: The Silurian–Devonian boundary worldwide marks a major geological time division approximately 419 million years ago, characterized by significant evolutionary and environmental changes recorded in rock strata across the globe.
-
A.
Global Boundary Stratotype Section and Point for base of Hettangian
The Global Boundary Stratotype Section and Point for the base of the Hettangian is the internationally agreed geological reference point that marks the formal beginning of the Jurassic Period and the Mesozoic era’s post-Triassic recovery interval.
-
B.
Frasnian–Famennian boundary
The Frasnian–Famennian boundary marks a major Late Devonian mass extinction interval characterized by severe global environmental upheavals and widespread marine biodiversity loss.
-
C.
Emsian–Eifelian boundary
The Emsian–Eifelian boundary marks the internationally recognized transition between the Early and Middle Devonian periods in the geologic timescale.
-
D.
Global Boundary Stratotype Section and Point for the base of the Anisian
The Global Boundary Stratotype Section and Point for the base of the Anisian is the internationally agreed geological reference point that marks the beginning of the Anisian Stage and thus the formal onset of the Middle Triassic.
-
E.
Givetian–Frasnian boundary
The Givetian–Frasnian boundary marks the internationally recognized stratigraphic transition between the Middle and Late Devonian periods, defined by specific fossil and sedimentary changes in the geologic record.
- F. None of above. chosen
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.