Ludfordian Age
E538403
The Ludfordian Age is a late Silurian time interval characterized by significant marine biodiversity changes and notable graptolite and conodont fossil assemblages.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Ludfordian Age canonical | 1 |
| Ludfordian Stage | 1 |
| Sheinwoodian Age | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5631598 — 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: Ludfordian Age Context triple: [Pridoli Epoch, follows, Ludfordian Age]
-
A.
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.
-
B.
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.
-
C.
Tithonian
The Tithonian is the final age of the Late Jurassic period, marked by diverse marine life and significant evolutionary developments among dinosaurs and other vertebrates.
-
D.
Toarcian
The Toarcian is a stage of the Early Jurassic period characterized by significant marine life diversification and notable oceanic anoxic events.
-
E.
Terreneuvian
The Terreneuvian is the earliest age of the Cambrian Period, marking the beginning of the Phanerozoic Eon and the widespread appearance of complex animal life in the fossil 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: Ludfordian Age Target entity description: The Ludfordian Age is a late Silurian time interval characterized by significant marine biodiversity changes and notable graptolite and conodont fossil assemblages.
-
A.
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.
-
B.
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.
-
C.
Tithonian
The Tithonian is the final age of the Late Jurassic period, marked by diverse marine life and significant evolutionary developments among dinosaurs and other vertebrates.
-
D.
Toarcian
The Toarcian is a stage of the Early Jurassic period characterized by significant marine life diversification and notable oceanic anoxic events.
-
E.
Terreneuvian
The Terreneuvian is the earliest age of the Cambrian Period, marking the beginning of the Phanerozoic Eon and the widespread appearance of complex animal life in the fossil record.
- F. None of above. chosen
Statements (36)
| Predicate | Object |
|---|---|
| instanceOf |
chronostratigraphic unit
ⓘ
geologic age ⓘ |
| associatedWith |
Lau extinction event
ⓘ
changes in conodont diversity ⓘ changes in graptolite diversity ⓘ reef ecosystem perturbations ⓘ |
| characterizedBy |
notable conodont fossil assemblages
ⓘ
notable graptolite fossil assemblages ⓘ significant marine biodiversity changes ⓘ |
| chronologicalContext |
after mid-Silurian biodiversification
ⓘ
before Pridoli faunal assemblages ⓘ |
| contains | Lau Event ⓘ |
| correspondsTo |
Ludfordian Stage
ⓘ
linked to:
Ludfordian Age
|
| definedBy | Global Boundary Stratotype Section and Point ⓘ |
| discipline |
paleontology
ⓘ
stratigraphy ⓘ |
| follows | Gorstian Age ⓘ |
| fossilRecord |
abundant conodonts
ⓘ
abundant graptolites ⓘ brachiopods ⓘ corals ⓘ |
| governingBody | International Commission on Stratigraphy ⓘ |
| GSSPLocation | Ludford Lane, near Ludlow, Shropshire, England ⓘ |
| namedAfter | Ludford, Shropshire, England ⓘ |
| paleogeography | dominantly marine environments ⓘ |
| partOf |
Ludlow Epoch
ⓘ
Ludlow Series ⓘ Paleozoic Era ⓘ Silurian Period ⓘ
linked to:
Silurian
|
| positionInTimeScale | late Silurian ⓘ |
| precedes | Pridoli Epoch ⓘ |
| stratigraphicUsage | upper Ludlow Series ⓘ |
| subdivisionOf |
Silurian System
ⓘ
linked to:
Silurian
|
| timeScaleRank | age ⓘ |
| usedFor | correlation of Silurian marine strata ⓘ |
| usedIn |
international geologic time scale
ⓘ
linked to:
International Chronostratigraphic Chart
|
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: Ludfordian Age Description of subject: The Ludfordian Age is a late Silurian time interval characterized by significant marine biodiversity changes and notable graptolite and conodont fossil assemblages.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Ludfordian Age
linked to: Ludfordian Age