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Berriasian Stage
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Berriasian Stage

stratigraphy
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Berriasian Age
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Berriasian Stage, first of six main divisions (in ascending order) of the Lower Cretaceous Series, representing rocks deposited worldwide during the Berriasian Age, which occurred between 145 million and 139.8 million years ago during the Cretaceous Period. Rocks of the Berriasian overlie those of the Jurassic System’s Tithonian Stage and underlie rocks of the Valanginian Stage.

The name for this stage is derived from Berrias, in southeastern France, and the area surrounding Berrias serves as the classic type district for rocks of this age. The Berriasian Stage is characterized by a distinct ammonite genus used as an index fossil.

This article was most recently revised and updated by John M. Cunningham.