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Silurian: History & Geography
The Silurian (/sɪˈljʊəri.ən, saɪ-/ sih-LURE-ee-ən, sy-) is a geologic period and system spanning 23.5 million years from the end of the Ordovician Period, at 443.1 Ma (million years ago) to the beginning of the Devonian Period, 419.62 Ma. The Silurian is the third and shortest period of the Paleozoic Era, and the third of twelve periods of the…
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Silurian topic overview
The analysis highlights History and Geography as prominent areas in the source structure around Silurian.
Related topics
146
Source areas
5
Connected nodes
151
Extracted relationships
147
Concept neighborhoods
32
Bridge connections
151
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.
Flora and fauna · 69 topics
Overview · 26 topics
Paleogeography · 20 topics
History of study · 17 topics
Climate and sea level · 14 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
Roderick Murchison, 1835
Lower boundary definition
FAD of the Graptolite Akidograptus ascensus
Lower GSSP ratified
1984
Name formality
Formal
Explore all related topics Closing gaps
A structured outline of related entities, concepts and subtopics. Open any item to build a new map centered on it.
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.
Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.
How Silurian connects Entity context
Entity context groups extracted connections by relationship type. Counts show recurrence in the analyzed source; the examples are research signals, not claims about importance.
The extracted context around Silurian shows recurring relationship patterns in the source. For example, Silurian → Adam Sedgwick, An, As, Baltic, British, Caer Caradoc, Cambrian, Cambrian Systems, Celtic, Charles Lapworth, England, Exhibiting, Geologic, Gotland, Gotlandian, He, In, Latin, Map, Murchison Another extracted example is Silurian → Anderson, Bibcode, Braddy, Briggs, Cambridge University Press, Cesare, Chelicerata, Cosmology, DEG, DEG Briggs, DG, Emiliani, Environment, Evolution, Geology, Journal, Kluessendorf, Late Llandovery, LI, Life. Use these groups to spot repeated connection types before inspecting the individual relationships.
Silurian
Top relations
related to history· 35
Silurian → Adam Sedgwick, An, As, Baltic, British, Caer Caradoc, Cambrian, Cambrian Systems, Celtic, Charles Lapworth, England, Exhibiting, Geologic, Gotland, Gotlandian, He, In, Latin, Map, Murchison
related to References· 35
Silurian → Anderson, Bibcode, Braddy, Briggs, Cambridge University Press, Cesare, Chelicerata, Cosmology, DEG, DEG Briggs, DG, Emiliani, Environment, Evolution, Geology, Journal, Kluessendorf, Late Llandovery, LI, Life
Relationships are represented as Subject → Predicate → Object triples. Confidence describes extraction strength, not the real-world importance of a relationship; lower-confidence rows may be contextual rather than explicit.
TTTA extracted 147 structured relationships around Silurian. Examples in this analysis include Silurian → Celestial body → Earth and Silurian → Chronological unit → Period. The table shows each extracted connection, where it came from and its confidence.
Subject
Predicate
Object
Confidence
Src
Silurian
Celestial body
Earth
1.00
infobox
Silurian
Chronological unit
Period
1.00
infobox
Silurian
First proposed by
Roderick Murchison, 1835
1.00
infobox
Silurian
Lower boundary definition
FAD of the Graptolite Akidograptus ascensus
1.00
infobox
Silurian
Lower boundary GSSP
Dob's Linn, Moffat, United Kingdom .mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-nondefault,.mw-pars…
Concept neighborhoods group terms that sit near one another in the extracted graph. They are useful for discovering adjacent language and context, but proximity does not by itself imply a factual relationship.
The concept neighborhoods around Silurian bring nearby vocabulary together. In this analysis, examples include Ordovician, Sea and First. Use the clusters to find adjacent concepts and terminology that may deserve separate research.
Silurian
Ordovician
Sea
First
Strata
Fossils
Late
Middle
Early
Devonian
Known
Llandovery
Scale
silurian
Ordovician
Sea
First
Strata
Fossils
Late
Middle
Early
Devonian
Known
Llandovery
Scale
geologic period and system
Million
Identified
Years
First
Silurian
Ordovician
Sea
Ago
Level
Climate
Devonian
Earth
devonian
Ordovician
Ics
Geologic
Years
Ma
Middle
Early
Silurian
Million
Paleozoic
Period
System
ordovician–silurian extinction events
Devonian
Period
Ordovician
Sea
Silurian
Ago
System
Years
First
Lome
Strata
Fossils
late ordovician mass extinction
Devonian
New
Period
Silurian
Ago
System
Years
Lome
Paleozoic
Rock
Sea
Brachiopods
early devonian
Ordovician
Ics
Geologic
Ma
Middle
Years
Early
Known
Silurian
Level
Million
Paleozoic
climate and sea level
Sea
Ics
Earth
Years
Scale
Period
Silurian
First
Million
Rock
System
Wales
Connections between topic areas Semantic bridges
Semantic bridges connect parts of the graph that would otherwise be more separate. A bridge is a structural signal in this analysis, not a claim that the two topic areas are equivalent.
For Silurian, one of the stronger structural bridges in this analysis connects Silurian with Flora and fauna. 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
Silurian — Flora and fauna· splits 82 ⟂ 70Silurian — Overview· splits 125 ⟂ 27Silurian — Paleogeography· splits 131 ⟂ 21Silurian — History of study· splits 134 ⟂ 18Silurian — Climate and sea level· splits 137 ⟂ 15
Map overview Semantic statistics
Number of nodes, edges, triples, density and central hubs. Use it to gauge the size and connectivity of the map.
Silurian
Nodes152
Edges151
Triples147
Avg. degree1.99
Density0.013158
Components1
Source & methodology
TTTA analyzes the structure around Silurian to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as History & Geography, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.
