Middle Ordovician
E398622
The Middle Ordovician is a subdivision of the Ordovician Period characterized by significant diversification of marine life and widespread shallow epicontinental seas.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Middle Ordovician canonical | 3 |
| Early Ordovician | 1 |
| Middle Ordovician Epoch | 1 |
| Middle Ordovician Series | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3899032 — 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: Middle Ordovician Context triple: [Ordovician Period, subdividedInto, Middle Ordovician]
-
A.
Middle Devonian
The Middle Devonian is a subdivision of the Devonian Period, dating to roughly 393–383 million years ago, marked by extensive marine life diversification and the continued evolution of early terrestrial ecosystems.
-
B.
Ordovician Period
The Ordovician Period was a Paleozoic era interval marked by extensive marine biodiversity, the diversification of early vertebrates and invertebrates, and ending with one of Earth's major mass extinction events.
-
C.
Early Devonian
The Early Devonian was the initial subdivision of the Devonian Period, marked by the diversification of early fishes and the spread of primitive vascular land plants across emerging terrestrial ecosystems.
-
D.
Middle Triassic
The Middle Triassic is the middle epoch of the Triassic Period, marked by the recovery of life after the end-Permian mass extinction and the early diversification of dinosaurs and marine reptiles.
-
E.
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.
- 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: Middle Ordovician Target entity description: The Middle Ordovician is a subdivision of the Ordovician Period characterized by significant diversification of marine life and widespread shallow epicontinental seas.
-
A.
Middle Devonian
The Middle Devonian is a subdivision of the Devonian Period, dating to roughly 393–383 million years ago, marked by extensive marine life diversification and the continued evolution of early terrestrial ecosystems.
-
B.
Ordovician Period
The Ordovician Period was a Paleozoic era interval marked by extensive marine biodiversity, the diversification of early vertebrates and invertebrates, and ending with one of Earth's major mass extinction events.
-
C.
Early Devonian
The Early Devonian was the initial subdivision of the Devonian Period, marked by the diversification of early fishes and the spread of primitive vascular land plants across emerging terrestrial ecosystems.
-
D.
Middle Triassic
The Middle Triassic is the middle epoch of the Triassic Period, marked by the recovery of life after the end-Permian mass extinction and the early diversification of dinosaurs and marine reptiles.
-
E.
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.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
epoch
ⓘ
geologic period subdivision ⓘ |
| associatedWith | Great Ordovician Biodiversification Event ⓘ |
| biostratigraphyMarker |
conodont zones
ⓘ
graptolite zones ⓘ |
| characterizedBy |
diversification of marine life
ⓘ
high sea levels ⓘ warm global climate ⓘ widespread shallow epicontinental seas ⓘ |
| chronostratigraphicUnit |
Middle Ordovician
self-linksurface differs
ⓘ
surface form:
Middle Ordovician Series
|
| climate | generally greenhouse conditions ⓘ |
| containsStage |
Dapingian Stage
ⓘ
Darriwilian Stage ⓘ |
| definedBy | International Commission on Stratigraphy ⓘ |
| endTime | approximately 458 million years ago ⓘ |
| environment |
epicontinental seas
ⓘ
shallow marine shelves ⓘ |
| followedByEvent | further biodiversification in Late Ordovician ⓘ |
| follows | Early Ordovician ⓘ |
| fossilRecord | abundant marine invertebrates ⓘ |
| geochronologicUnit |
Middle Ordovician
self-linksurface differs
ⓘ
surface form:
Middle Ordovician Epoch
|
| hasSubdivision |
Dapingian
ⓘ
Darriwilian ⓘ |
| importantFor | correlation of marine sedimentary rocks worldwide ⓘ |
| lithology |
limestones
ⓘ
sandstones ⓘ shales ⓘ |
| marineLifeDiversification |
brachiopods
ⓘ
bryozoans ⓘ echinoderms ⓘ graptolites ⓘ nautiloid cephalopods ⓘ trilobites ⓘ |
| notableFauna |
orthocone cephalopods
ⓘ
reef-building organisms ⓘ |
| paleogeography |
extensive continental flooding
ⓘ
fragmented continents ⓘ |
| partOf |
Ordovician Period
ⓘ
Paleozoic Era ⓘ |
| precededByEvent | Early Ordovician radiation ⓘ |
| precedes | Late Ordovician ⓘ |
| relevantDiscipline |
paleontology
ⓘ
stratigraphy ⓘ |
| seaLevel | among the highest of the Phanerozoic ⓘ |
| startTime | approximately 470 million years ago ⓘ |
| tectonicActivity | ongoing orogenies in some regions ⓘ |
| timeScaleRank |
epoch (in some classifications)
ⓘ
series ⓘ |
| usedIn | geologic time scale ⓘ |
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: Middle Ordovician Description of subject: The Middle Ordovician is a subdivision of the Ordovician Period characterized by significant diversification of marine life and widespread shallow epicontinental seas.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Early Ordovician
this entity surface form:
Middle Ordovician Series
this entity surface form:
Middle Ordovician Epoch