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Ordovician

Hierarchy:Phanerozoic Paleozoic
  Ordovician
Classification:Period (as per International Commission on Stratigraphy)
Top:443.8 ± 1.5 Ma
Base:485.4 ± 1.9 Ma
Preceeds:Silurian Llandovery  Rhuddanian
Follows:Cambrian Furongian  Cambrian Stage 10
Primary Divisions:Late OrdovicianMiddle OrdovicianEarly Ordovician
FGDC code:O
Invertebrates diversify into many new types (e.g., long straight-shelled cephalopods). Early corals, articulate brachiopods (Orthida, Strophomenida, etc.), bivalves, nautiloids, trilobites, ostracods, bryozoa, many types of echinoderms (crinoids, cystoids, starfish, etc.), branched graptolites, and other taxa all common. Conodonts (early planktonic vertebrates) appear. First green plants and fungi on land. Ice age at end of period.
 

Geologic Events

Event NameTypeAgeArea
Ordovician–Silurian extinction events (concludes)Mass Extinction Event~455 - ~430 MaGlobal
Caledonian orogeny (concludes)Orogeny~505 - ~400 MaEurope
Ross orogeny (concludes)Orogeny~550 - ~480 MaAntarctica


Overview of geological time

List all geological events
Mineral and/or Locality  
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