Template: Ordovician graphical timeline

Key events in the Ordovician Period

-490 —

–

-485 —

–

-480 —

–

-475 —

–

-470 —

–

-465 —

–

-460 —

–

-455 —

–

-450 —

–

-445 —

–

 

 

Cambrian period

 

Tremadocian

Floian

Dapingian

Darriwilian

Sandbian

Katian

Hirnantian

Hirnantian

Early Ordovician

Llanvirn

Llandeillo

Caradoc

Ashgill

Silurian period

 

 

←

First land plant spores

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 Paleozoic era

Key events of the Ordovician period.
Left: ICS approved stages.
Right: "General" stages.
Axis scale: millions of years ago.

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