ordovician

Noun
  1. From 500 million to 425 million years ago;
    Conodonts and ostracods and algae and seaweeds (synset 115153315)
    is an instance of: geological period, period - a unit of geological time during which a system of rocks formed
    is a part of: paleozoic, paleozoic era - from 544 million to about 230 million years ago
    same as: ordovician period

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