Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps


Noun: Ordovician period
  1. From 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds
    - Ordovician

Type of: geological period, period

Part of: Palaeozoic [Brit, Cdn], Paleozoic, Paleozoic era

Encyclopedia: Ordovician period