Darriwilian
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| Ordovician period 488-444 | ||||||
|---|---|---|---|---|---|---|
| Early Ordovician 488-472 | Middle Ordovician 472-461 | Late Ordovician 461-444 | ||||
| Tremadocian 488-479 | Floian 479-472 | Dapingian 472-468 | Darriwilian 468-461 | Sandbian 461-456 | Katian 456-446 | Hirnantian 446-444 |
468 to 461 million years ago
The Darriwilian is the second and last age of the Middle Ordovician. It is defined by the first appearance of the graptolite Undulograptus austrodentatus at the type section in Changshan, Zhejiang Province, China.
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