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Ordovician: Geography & Art

The Ordovician (/ɔːrdəˈvɪʃi.ən, -doʊ-, -ˈvɪʃən/ or-də-VISH-ee-ən, -⁠doh-, -⁠VISH-ən) is a geologic period and system, the second of six periods of the Paleozoic Era, and the second of twelve periods of the Phanerozoic Eon. The Ordovician spans 43.75 million years from the end of the Cambrian Period 486.85 Ma (million years ago) to the start of the…

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Ordovician topic overview

The analysis highlights Geography and Art as prominent areas in the source structure around Ordovician.

Related topics
155
Source areas
7
Connected nodes
162
Extracted relationships
176
Concept neighborhoods
35
Bridge connections
162

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.

Life · 67 topics
Overview · 30 topics
Paleogeography and tectonics · 23 topics
End of the period · 14 topics
Climate and sea level · 13 topics
Geochemistry · 6 topics
Subdivisions · 2 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
First proposed by
Charles Lapworth, 1879
Lower boundary definition
FAD of the Conodont Iapetognathus fluctivagus
Lower GSSP ratified
January 2000: 19
Name formality
Formal

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

Subdivisions

  • ICS International Classification for Standards
  • Gondwanan Gondwana

Paleogeography and tectonics

Geochemistry

Climate and sea level

Life

End of the period

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 Ordovician connects Entity context

The extracted context around Ordovician shows recurring relationship patterns in the source. For example, Ordovician → Africa, Baltoscandia, Boda Event, By, Carbon, Darriwilian, Despite, During, Early Eocene Climatic Optimum, Early Ordovician, Early Palaeozoic Ice Age, Earth, Europe, Evidence, Floian, Further, Hibernian, Hirnantian, In, Katian Another extracted example is Ordovician → Alborz, Another, Argentinian, Articulate, Baltica, Baltican, Cambrian, Celtic, During, Faunas, Gondwana, Gondwana's, Great Ordovician Biodiversification Event, However, Iapetus Ocean, Laurentia, Laurentian, Middle Ordovician, North China, On. Use these groups to spot repeated connection types before inspecting the individual relationships.

Ordovician

Top relations

related to Climate and sea level · 33
Ordovician → Africa, Baltoscandia, Boda Event, By, Carbon, Darriwilian, Despite, During, Early Eocene Climatic Optimum, Early Ordovician, Early Palaeozoic Ice Age, Earth, Europe, Evidence, Floian, Further, Hibernian, Hirnantian, In, Katian
related to Fauna · 30
Ordovician → Alborz, Another, Argentinian, Articulate, Baltica, Baltican, Cambrian, Celtic, During, Faunas, Gondwana, Gondwana's, Great Ordovician Biodiversification Event, However, Iapetus Ocean, Laurentia, Laurentian, Middle Ordovician, North China, On
related to External links · 23
Ordovician → An Ordovician, April, Archived, Charlotte, Chazy Reef, Cincinnatian Group Archived, December, Global Boundary Stratotype Sections, GSSP's, Isle La Motte, January, Jim, June, March, Mehrtens, October, Ogg, Overview, Points, Retrieved
related to Paleogeography and tectonics · 23
Ordovician → Aegir Ocean, Asia, At, Avalonia, Baltica, Carboniferous, Central Mongolian, During, Europe, Gondwana, Laurentia, Most, North America, Other, Paleoasian Ocean, Rheic Ocean, Siberia, South Pole, The, The Mongol-Okhotsk Ocean
related to Subdivisions · 12
Ordovician → Australian, British, Chinese, ICS, In, Mediterranean, North American, North-Gondwanan, Ordovician Period, Pre-existing Baltoscandic, Siberian, System
related to Life · 11
Ordovician → Agnostida, Asaphida, Brachiopods, Earth's, For, Late Ordovician, Ordovician Period, Ptychopariida, Silurian, The, The Ordovician
related to End of the period · 7
Ordovician → At, Earth's, Permian, Silurian Period, The, The Ordovician, Triassic
related to Flora · 7
Ordovician → Among, Fossil, Glomerales, Green, Late Cambrian, Terrestrial, Wisconsin
related to Geochemistry · 4
Ordovician → Biogenic, Carbonate, The Ordovician, Unlike Cambrian
related to Ordovician meteor event · 4
Ordovician → Earth, It, Middle Ordovician Epoch, The Ordovician

Important terminology

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

Important terminology

cambrian period late sea gondwana silurian years event first fauna brachiopods end middle time appeared land early trilobites million organisms

Ordovician relationships Subject–Predicate–Object triples

TTTA extracted 176 structured relationships around Ordovician. Examples in this analysis include Ordovician → Celestial body → Earth and Ordovician → Chronological unit → Period. The table shows each extracted connection, where it came from and its confidence.

SubjectPredicateObjectConfidenceSrc
OrdovicianCelestial bodyEarth1.00infobox
OrdovicianChronological unitPeriod1.00infobox
OrdovicianFirst proposed byCharles Lapworth, 18791.00infobox
OrdovicianLower boundary definitionFAD of the Conodont Iapetognathus fluctivagus1.00infobox
OrdovicianLower boundary GSSPGreenpoint section, Green Point, Newfoundland, Canada .mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-…1.00infobox
OrdovicianLower GSSP ratifiedJanuary 2000: 191.00infobox
OrdovicianName formalityFormal1.00infobox
OrdovicianName ratified19601.00infobox
OrdovicianRegional usageGlobal (ICS)1.00infobox
OrdovicianSea level above present day180 m; rising to 220 m in Caradoc and falling sharply to 141 m in end-Ordovician glaciations1.00infobox
OrdovicianStratigraphic unitSystem1.00infobox
OrdovicianTime scale(s) usedICS Time Scale1.00infobox
OrdovicianTime span formalityFormal1.00infobox
OrdovicianUpper boundary definitionFAD of the Graptolite Akidograptus ascensus1.00infobox
OrdovicianUpper boundary GSSPDob's Linn, Moffat, U.K. 55°26′24″N 3°16′12″W / 55.4400°N 3.2700°W / 55.4400; -3.27001.00infobox
OrdovicianUpper GSSP ratified19841.00infobox

Related concept clusters Concept neighborhoods

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

  • Ordovician
    • Late
    • Middle
    • Cambrian
    • End
    • Period
    • Sea
    • Early
    • Years
    • Event
    • First
    • Ago
    • Million
  • ordovician
    • Late
    • Middle
    • Cambrian
    • End
    • Period
    • Sea
    • Early
    • Years
    • Event
    • First
    • Ago
    • Million
  • geologic period
    • Years
    • End
    • Million
    • Earth
    • System
    • Ago
    • First
    • Level
    • Silurian
    • Continued
    • Life
    • May
  • cambrian
    • Silurian
    • Ordovician
    • Fauna
    • New
    • Appeared
    • Early
    • Paleozoic
    • System
    • Late
    • Ago
    • Continued
    • Known
  • fauna
    • Also
    • Organisms
    • Event
    • System
    • Life
    • Sea
    • Many
    • Earth
    • Ordovician
    • Bryozoans
    • Hirnantian
    • Known
  • ordovician–silurian extinction events
    • Late
    • Middle
    • Years
    • Extinction
    • Silurian
    • Cambrian
    • End
    • Period
    • Event
    • Sea
    • Early
    • Life
  • great ordovician biodiversification event
    • Late
    • Middle
    • Earth
    • Years
    • Cambrian
    • End
    • Period
    • Extinction
    • Million
    • Sea
    • Early
    • Fauna
  • ordovician meteor event
    • Late
    • Middle
    • Earth
    • Years
    • Cambrian
    • End
    • Period
    • Extinction
    • Million
    • Sea
    • Early
    • Fauna

Connections between topic areas Semantic bridges

For Ordovician, one of the stronger structural bridges in this analysis connects Ordovician with Life. 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
OrdovicianLife · splits 95 ⟂ 68
OrdovicianOverview · splits 132 ⟂ 31
OrdovicianPaleogeography and tectonics · splits 139 ⟂ 24
OrdovicianEnd of the period · splits 148 ⟂ 15
OrdovicianClimate and sea level · splits 149 ⟂ 14
OrdovicianGeochemistry · splits 156 ⟂ 7
OrdovicianSubdivisions · splits 160 ⟂ 3

Map overview Semantic statistics

Ordovician

Nodes163
Edges162
Triples176
Avg. degree1.99
Density0.01227
Components1

Source & methodology

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

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

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