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Darriwilian Stage
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Ordovician System
Ordovician System The Ordovician Period began 485.4 million years ago and ended 443.8 million years ago.

Darriwilian Stage

geology
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Article History

Darriwilian Stage, second (in ascending order) of two main divisions in the Middle Ordovician Series, representing rocks deposited worldwide during the Darriwilian Age, which occurred between 467.3 million and 458.4 million years ago during the Ordovician Period. Rocks of the Darriwilian Stage overlie those of the Dapingian Stage and underlie rocks of the Sandbian Stage. The Darriwilian is distinguished by the presence of a graptolite fossil fauna composed of two species of the genus Undulograptus and a single species of the genus Arienigraptus found in the Ningkuo Formation in Zhejiang province, China.

This article was most recently revised and updated by John P. Rafferty.