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.
|Ordovician–Silurian extinction events (concludes)||Mass Extinction Event||~455 - ~430 Ma||Global|
|Caledonian orogeny (concludes)||Orogeny||~505 - ~400 Ma||Europe|
|Ross orogeny (concludes)||Orogeny||~550 - ~480 Ma||Antarctica|
Overview of geological time
List all geological events