Early Devonian

E27677

geologic time interval subdivision of the Devonian Period

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.

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All labels observed (3)

Label	Occurrences
Early Devonian canonical	3
Early Devonian Period	1
Lower Devonian Series	1

Statements (49)

Predicate	Object
instanceOf	geologic time interval ⓘ subdivision of the Devonian Period ⓘ
associatedWith	Rhynie Chert fossil locality ⓘ
boundaryDefinedBy	Global Boundary Stratotype Section and Point at Klonk, Czech Republic ⓘ first appearance of the conodont Icriodus woschmidti ⓘ
characterizedBy	brachiopod-rich marine faunas ⓘ development of early terrestrial ecosystems ⓘ diversification of early fishes ⓘ early ammonoid ancestors ⓘ evolution of early coral reefs ⓘ expansion of jawed fishes ⓘ expansion of terrestrial habitats along coastlines and floodplains ⓘ extensive shallow epicontinental seas ⓘ high sea levels ⓘ marine invertebrate diversification ⓘ presence of jawless agnathan fishes ⓘ spread of primitive vascular land plants ⓘ trilobite faunas in decline compared to earlier Paleozoic ⓘ warm global climate ⓘ
chronostratigraphicUnit	Early Devonian self-linksurface differs ⓘ surface form: Lower Devonian Series
containsStage	Emsian ⓘ Lochkovian ⓘ Pragian ⓘ
endTime	approximately 393.3 million years ago ⓘ
fauna	early acanthodian fishes ⓘ early placoderm fishes ⓘ jawless ostracoderms ⓘ lobe-finned sarcopterygian fishes ⓘ ray-finned actinopterygian fishes ⓘ rugose corals ⓘ stromatoporoid sponges ⓘ tabulate corals ⓘ
follows	Pridoli Epoch ⓘ
geologicalSetting	active orogeny in Caledonian mountain belts ⓘ assembly of Euramerica continent ⓘ
notableFossils	Aglaophyton ⓘ Rhynia ⓘ early terrestrial arthropods in Rhynie Chert ⓘ
partOf	Devonian Period ⓘ
plantFlora	early lycophytes ⓘ primitive vascular plants ⓘ rhyniophytes ⓘ simple leafless stems with sporangia ⓘ zosterophylls ⓘ
precedes	Middle Devonian ⓘ
startTime	approximately 419.2 million years ago ⓘ
timeScale	Paleozoic Era ⓘ Phanerozoic Eon ⓘ
usedIn	International Commission on Stratigraphy ⓘ surface form: International Commission on Stratigraphy timescale

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: Early Devonian
Description of subject: 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.

Referenced by (5)

Full triples — surface form annotated when it differs from this entity's canonical label.

Old Red Sandstone → geologicPeriodStart → Early Devonian ⓘ

Early Devonian → chronostratigraphicUnit → Early Devonian self-linksurface differs ⓘ

this entity surface form: Lower Devonian Series

Devonian Period → hasSubdivision → Early Devonian ⓘ

Age of Fishes → includesStage → Early Devonian ⓘ

Laurussia continent → formedDuringPeriod → Early Devonian ⓘ

subject surface form: Laurussia

this entity surface form: Early Devonian Period