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Graptolithina
Colonial marine animals of the Ordovician and Silurian whose fossils date the rocks.
Species
Identifiers
Wikidata Q332403
Appears in
3 items
The Big Five Mass Extinctions
3 items
Ordovician
c. 486.85 Ma
First pulse: the ice builds
c. 445 Ma
Second pulse: the ice melts
c. 443.5 Ma
Sources
Article
End Ordovician extinctions: a coincidence of causes
