Middle Devonian
E147846
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.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Middle Devonian canonical | 10 |
| Devonian Series 2 (Middle Devonian) | 1 |
| Middle Devonian Series | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1297075 — 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 Devonian Context triple: [Early Devonian, precedes, Middle Devonian]
-
A.
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.
-
B.
Devonian Period
The Devonian Period was a division of the Paleozoic Era characterized by the diversification of fish, the first significant colonization of land by plants and early tetrapods, and major reef-building in the oceans.
-
C.
Silurian
The Silurian is a geologic period of the Paleozoic Era, roughly 443 to 419 million years ago, marked by the stabilization of Earth’s climate, widespread shallow seas, and significant diversification of early marine life and the first land plants.
-
D.
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.
-
E.
Carboniferous period
The Carboniferous period was a Paleozoic era interval, roughly 359 to 299 million years ago, characterized by extensive swampy forests that formed vast coal deposits and by the diversification of early amphibians and insects.
- 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 Devonian Target entity description: 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.
-
A.
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.
-
B.
Devonian Period
The Devonian Period was a division of the Paleozoic Era characterized by the diversification of fish, the first significant colonization of land by plants and early tetrapods, and major reef-building in the oceans.
-
C.
Silurian
The Silurian is a geologic period of the Paleozoic Era, roughly 443 to 419 million years ago, marked by the stabilization of Earth’s climate, widespread shallow seas, and significant diversification of early marine life and the first land plants.
-
D.
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.
-
E.
Carboniferous period
The Carboniferous period was a Paleozoic era interval, roughly 359 to 299 million years ago, characterized by extensive swampy forests that formed vast coal deposits and by the diversification of early amphibians and insects.
- F. None of above. chosen
Statements (43)
| Predicate | Object |
|---|---|
| instanceOf |
geologic age
ⓘ
subdivision of the Devonian Period ⓘ |
| associatedWith |
Gondwanan continental landmasses
ⓘ
linked to:
Gondwana
Laurussian continental landmasses ⓘ |
| characterizedBy |
abundant brachiopods
ⓘ
abundant corals ⓘ armored jawless fishes ⓘ development of complex root systems in plants ⓘ diverse ammonoids ⓘ diverse trilobites ⓘ diversification of marine life ⓘ early jawed fishes ⓘ early tetrapodomorph fishes ⓘ evolution of early forests ⓘ expansion of early terrestrial ecosystems ⓘ expansion of vascular land plants ⓘ formation of extensive carbonate platforms ⓘ reef development ⓘ warm greenhouse climate ⓘ |
| chronostratigraphicUnit | series ⓘ |
| contains |
Eifelian
ⓘ
Givetian ⓘ |
| endBoundary | Givetian–Frasnian boundary ⓘ |
| endTime | approximately 383 million years ago ⓘ |
| follows | Early Devonian ⓘ |
| geochronologicUnit | epoch ⓘ |
| hasGlobalStandardStratotype |
Eifelian GSSP at Wetteldorf, Germany
ⓘ
Givetian GSSP at Jebel Mech Irdane, Morocco ⓘ |
| importantFor |
correlation of marine sedimentary rocks
ⓘ
study of early terrestrial ecosystems ⓘ study of early vertebrate evolution ⓘ |
| paleogeography |
high sea levels
ⓘ
widespread shallow epicontinental seas ⓘ |
| partOf |
Devonian Period
ⓘ
Paleozoic Era ⓘ Phanerozoic Eon ⓘ |
| precedes | Late Devonian ⓘ |
| startBoundary | Emsian–Eifelian boundary ⓘ |
| startTime | approximately 393 million years ago ⓘ |
| temporalPosition |
after Silurian Period
ⓘ
before Carboniferous Period ⓘ |
| timeScaleRank | middle subdivision of the Devonian ⓘ |
| usedIn |
International Commission on Stratigraphy timescale
ⓘ
linked to:
International Commission on 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: Middle Devonian Description of subject: 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.
Referenced by (12)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Middle Devonian
linked to: Middle Devonian