Eifelian
E538407
Eifelian is a stage of the Middle Devonian period characterized by significant marine biodiversity and the evolution of early reef ecosystems.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Eifelian canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5631652 — 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: Eifelian Context triple: [Middle Devonian, contains, Eifelian]
-
A.
Arenig Fawr
Arenig Fawr is a prominent mountain in southern Snowdonia, Wales, known for its rugged summit and expansive views over the surrounding uplands and lakes.
-
B.
Miaolingian
Miaolingian is a middle subdivision of the Cambrian Period characterized by significant diversification of marine life and important trilobite-bearing rock formations.
-
C.
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.
-
D.
Yoldia stage
The Yoldia stage is a postglacial Baltic Sea phase characterized by cold, brackish-water conditions and named after the bivalve Yoldia (Portlandia) arctica, whose fossils are typical of its sediments.
-
E.
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.
- 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: Eifelian Target entity description: Eifelian is a stage of the Middle Devonian period characterized by significant marine biodiversity and the evolution of early reef ecosystems.
-
A.
Arenig Fawr
Arenig Fawr is a prominent mountain in southern Snowdonia, Wales, known for its rugged summit and expansive views over the surrounding uplands and lakes.
-
B.
Miaolingian
Miaolingian is a middle subdivision of the Cambrian Period characterized by significant diversification of marine life and important trilobite-bearing rock formations.
-
C.
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.
-
D.
Yoldia stage
The Yoldia stage is a postglacial Baltic Sea phase characterized by cold, brackish-water conditions and named after the bivalve Yoldia (Portlandia) arctica, whose fossils are typical of its sediments.
-
E.
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.
- F. None of above. chosen
Statements (44)
| Predicate | Object |
|---|---|
| instanceOf | geologic age ⓘ |
| associatedWith |
diversification of marine ecosystems
ⓘ
evolution of early reef-building organisms ⓘ radiation of jawed fishes ⓘ |
| biostratigraphicMarkers |
brachiopod assemblages
ⓘ
conodont zonation ⓘ goniatite ammonoids ⓘ |
| characterizedBy |
abundant marine invertebrates
ⓘ
carbonate platform development ⓘ development of early reef ecosystems ⓘ diverse brachiopod faunas ⓘ diverse coral faunas ⓘ diverse trilobite faunas ⓘ expansion of stromatoporoid reefs ⓘ high marine biodiversity ⓘ |
| chronologicalPosition | early stage of the Middle Devonian ⓘ |
| correlatesWith |
regional Middle Devonian stages in Europe
ⓘ
regional Middle Devonian stages in North America ⓘ |
| endTime | approximately 387.7 million years ago ⓘ |
| era |
Paleozoic
ⓘ
linked to:
Paleozoic Era
|
| follows | Emsian ⓘ |
| fossilRecordImportance |
important for brachiopod and coral zonations
ⓘ
important for conodont biostratigraphy ⓘ key interval for studying reef evolution ⓘ |
| governingBodyForDefinition | International Commission on Stratigraphy ⓘ |
| lithostratigraphicExpression |
reef and peri-reef limestones
ⓘ
widespread carbonate shelf deposits ⓘ |
| locatedInTheAdministrativeTerritorialEntity | Germany ⓘ |
| namedAfter | Eifel region ⓘ |
| paleoclimate | generally warm climate ⓘ |
| paleogeography |
extensive epicontinental seas
ⓘ
widespread shallow marine environments ⓘ |
| partOf |
Devonian period
ⓘ
linked to:
Devonian Period
Middle Devonian ⓘ |
| positionInDevonian | second stage of the Devonian after the Lochkovian and Emsian ⓘ |
| precedes | Givetian ⓘ |
| rank | stage ⓘ |
| standardGlobalStratotypeSectionAndPoint | defined near Wetteldorf in the Eifel region ⓘ |
| startTime | approximately 393.3 million years ago ⓘ |
| subdivisionOf |
Devonian Series 2 (Middle Devonian)
ⓘ
linked to:
Middle Devonian
|
| system | Devonian ⓘ |
| timeScale |
International Commission on Stratigraphy timescale
ⓘ
linked to:
International Chronostratigraphic Chart
|
| usedFor |
dating of marine sedimentary sequences
ⓘ
global correlation of Middle Devonian strata ⓘ |
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: Eifelian Description of subject: Eifelian is a stage of the Middle Devonian period characterized by significant marine biodiversity and the evolution of early reef ecosystems.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.