Ordovician — synonyms, definition

1. Ordovician (Noun)

1 synonym
Ordovician period
1 definition

Ordovician (Noun) — From 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds.

2 types of
geological period period
3 parts of
Palaeozoic Paleozoic Paleozoic era