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Devonian: History, Geography & Regions

The Devonian (/dəˈvoʊni.ən, dɛ-/ də-VOH-nee-ən, deh-) is a geologic period and system of the Paleozoic era during the Phanerozoic eon, spanning 60.7 million years from the end of the preceding Silurian period at 419.62 million years ago (Ma), to the beginning of the succeeding Carboniferous period at 358.86 Ma. It is the fourth period of both the…

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Devonian topic overview

The analysis highlights History, Geography and Regions as prominent areas in the source structure around Devonian. 2 topics appear in more than one source area, which can help identify connections that are less obvious in a linear reading.

Related topics
268
Source areas
7
Connected nodes
277
Extracted relationships
364
Concept neighborhoods
47
Bridge connections
277

What this topic covers Research coverage

Source areas are shown by the number of related topics found in each part of the analysis. Use smaller areas too: they can reveal specialized angles and content gaps.

Overview · 91 topics
Paleogeography · 81 topics
Life · 50 topics
History · 18 topics
Subdivisions · 18 topics
Climate · 9 topics
Late Devonian extinction · 3 topics

Smaller areas are not necessarily less important. They contain fewer connections in this analysis and can be useful for finding specialized angles or coverage gaps.

Key facts & relationships

High-confidence facts extracted from structured source data. Use them as anchors for further research.

Celestial body
Earth
Chronological unit
Period
Lower boundary definition
FAD of the Graptolite Uncinatograptus uniformis
Lower GSSP ratified
1972
Name formality
Formal
Nickname(s)
Age of Fishes

Explore all related topics Closing gaps

Browse the complete topic structure, not only the most central items. Less prominent entities and concepts can reveal missing angles, specialized context and useful research gaps. Each item opens a new analysis centered on that subject.

Overview

History

Subdivisions

Climate

Paleogeography

Life

Late Devonian extinction

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

How Devonian connects Entity context

The extracted context around Devonian shows recurring relationship patterns in the source. For example, Devonian → Armorica, Armorican, Armorican Terrane Assemblage, As, Avalonia, Bohemia, Carboniferous, Central America, Early Devonian, Europe, France, Franconia, Galicia-Moldanubian, Gondwana, Iberia, In, It, Late Paleozoic, Laurussia, Mediterranean Another extracted example is Devonian → Although, Amuria, Annamia, Asia, Asian, Australian, Balkhash-West Junggar Arc, Cambrian, China, Cimmerian, Further, Gondwana, Indochina, Kazakhstania, Nevertheless, North China, Other Asian, Paleo-Tethys, Paleo-Tethys Ocean, Several. Use these groups to spot repeated connection types before inspecting the individual relationships.

Devonian

Top relations

related to Closure of the Rheic Ocean · 36
Devonian → Armorica, Armorican, Armorican Terrane Assemblage, As, Avalonia, Bohemia, Carboniferous, Central America, Early Devonian, Europe, France, Franconia, Galicia-Moldanubian, Gondwana, Iberia, In, It, Late Paleozoic, Laurussia, Mediterranean
related to Asian terranes · 32
Devonian → Although, Amuria, Annamia, Asia, Asian, Australian, Balkhash-West Junggar Arc, Cambrian, China, Cimmerian, Further, Gondwana, Indochina, Kazakhstania, Nevertheless, North China, Other Asian, Paleo-Tethys, Paleo-Tethys Ocean, Several
related to Laurussia · 32
Devonian → Acadian Orogeny, Appalachian Mountains, As, Baltica, Belgium, By, Caledonian Mountains, Caledonian Orogeny, Capricorn, Ellesmere Island, England, Euramerica, Europe, Ferrel, For, Further, Great Britain, Greenland, Hadley, In
related to Marine biota · 28
Devonian → Among, Armored, Bactritoids, Bivalves, Carboniferous, Chondrichthyes, Cladoselache, Devonian Nekton Revolution, Devonian Period, Early, Early Devonian, Fishes, However, Late Devonian, Lily-like, Lochkovian, Ma, Marine, Osteichthyes, Palaeozoic
related to Gallery · 24
Devonian → Aulopora, Bothriolepis, Cleveland Shale, Dunkleosteus, Eastmanosteus, Eusthenopteron, Famennian, Kashong Shale, Late Devonian, Late DevonianTitanichthys, Lower, Michigan, Mid, Middle Devonian, New YorkPleurodictyum, New YorkSEM, Ohio, OhioThe, Onychodus, Shark-like Cladoselache
related to Gondwana · 24
Devonian → Africa, Antarctica, Australia, Brazil, Chaitenia, Chile, Chilenia, Cuyania, Gondwana, It, Late Devonian, Malvinokaffric, Malvinokaffric Realm, Numerous, Panthalassa, Paraná Basin, Patagonia, South Africa, South America, South Pole
related to Paleogeography · 22
Devonian → Africa, Antarctica, Asia, Australia, Europe, Gondwana, India, It, Laurussia, North America, Northern Hemisphere, Other, Paleo-Tethys Ocean, Panthalassa, Rheic Ocean, Sea, South America, Southern Hemisphere, The, The Devonian
related to history · 21
Devonian → According, Adam Sedgwick, Beche, Carboniferous, Devon, Devonian Period, Devonian System, England, Henry De, International Commission, Ma, Mississippian, Murchison, North America, Roderick Murchison, Sedgwick, Silurian, Stratigraphy, The, The Great Devonian Controversy
related to External links · 18
Devonian → Age, Archived, Devonian Fossils, Devonian Times, Examples, February, Fishes, Geologic Time Scale, ICS, International Commission, Museum, October, Palaeos, Retrieved, September, Site, Stratigraphy, UC Berkeley
related to Climate · 15
Devonian → At, CO2, Devonian Period, Early, Early Devonian, Earth, Late Devonian, Late Paleozoic, Mid-Devonian, Middle Devonian, Reconstruction, The, The Devonian, The Late Devonian, This

Important terminology

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

early late period laurussia gondwana first land middle extinction fishes north ma plants south also marine ocean reefs continent carboniferous

Devonian relationships Subject–Predicate–Object triples

TTTA extracted 364 structured relationships around Devonian. Examples in this analysis include Devonian → Celestial body → Earth and Devonian → Chronological unit → Period. The table shows each extracted connection, where it came from and its confidence.

SubjectPredicateObjectConfidenceSrc
DevonianCelestial bodyEarth1.00infobox
DevonianChronological unitPeriod1.00infobox
DevonianLower boundary definitionFAD of the Graptolite Uncinatograptus uniformis1.00infobox
DevonianLower boundary GSSPKlonk, Czech Republic .mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-nondefault,.mw-parser-output .ge…1.00infobox
DevonianLower GSSP ratified19721.00infobox
DevonianName formalityFormal1.00infobox
DevonianNickname(s)Age of Fishes1.00infobox
DevonianRegional usageGlobal (ICS)1.00infobox
DevonianSea level above present dayRelatively steady around 189 m, gradually falling to 120 m through period1.00infobox
DevonianStratigraphic unitSystem1.00infobox
DevonianTime scale(s) usedICS Time Scale1.00infobox
DevonianTime span formalityFormal1.00infobox
DevonianUpper boundary definitionFAD of the Conodont Siphonodella sulcata (discovered to have biostratigraphic issues as of 2006).1.00infobox
DevonianUpper boundary GSSPLa Serre, Montagne Noire, France 43°33′20″N 3°21′26″E / 43.5555°N 3.3573°E / 43.5555; 3.35731.00infobox
DevonianUpper GSSP ratified19901.00infobox

Related concept clusters Concept neighborhoods

The concept neighborhoods around Devonian bring nearby vocabulary together. In this analysis, examples include Early, Late and Middle. Use the clusters to find adjacent concepts and terminology that may deserve separate research.

  • Devonian
    • Early
    • Late
    • Middle
    • Period
    • Laurussia
    • Ma
    • First
    • Land
    • End
    • Extinction
    • Plants
    • Fish
  • devonian
    • Early
    • Late
    • Middle
    • Period
    • Laurussia
    • Ma
    • First
    • Land
    • End
    • Extinction
    • Plants
    • Fish
  • geologic period
    • Early
    • Appeared
    • First
    • Land
    • Middle
    • Age
    • Silurian
    • Time
    • Ma
    • Also
    • Life
    • Although
  • paleozoic
    • Silurian
    • Late
    • Ma
    • Period
    • Early
    • Gondwana
    • Laurussia
    • Europe
    • Life
    • Rheic
    • Age
    • Much
  • ma
    • First
    • Silurian
    • Appeared
    • Extinction
    • Also
    • Middle
    • Paleozoic
    • Life
    • Early
    • Reefs
    • Fishes
    • Period
  • carboniferous
    • Silurian
    • Ma
    • Paleozoic
    • Life
    • Rheic
    • Began
    • End
    • Ocean
    • Land
    • Gondwana
    • Laurussia
    • Period
  • life on land
    • Plants
    • Marine
    • Life
    • Early
    • Period
    • Reefs
    • Much
    • Fishes
    • Time
    • Extinction
    • Ma
    • Also
  • land plants
    • Plants
    • Life
    • Early
    • Period
    • Much
    • Time
    • Also
    • Late
    • Although
    • Silurian
    • Fish
    • Appeared

Connections between topic areas Semantic bridges

For Devonian, one of the stronger structural bridges in this analysis connects Devonian with Overview. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.

Min side: 3
DevonianOverview · splits 186 ⟂ 92
DevonianPaleogeography · splits 196 ⟂ 82
DevonianLife · splits 227 ⟂ 51
DevonianHistory · splits 259 ⟂ 19
DevonianSubdivisions · splits 259 ⟂ 19
DevonianClimate · splits 268 ⟂ 10
DevonianLate Devonian extinction · splits 274 ⟂ 4

Map overview Semantic statistics

Devonian

Nodes278
Edges277
Triples364
Avg. degree1.99
Density0.007194
Components1

Source & methodology

TTTA analyzes the structure around Devonian to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as History, Geography & Regions, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.

Source: Wikipedia — Devonian · EN edition · Analysis: TopicsToTalkAbout

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