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Barremian Stage
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Barremian Stage

stratigraphy
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Barremian Stage, fourth of six main divisions (in ascending order) in the Lower Cretaceous Series, representing rocks deposited worldwide during the Barremian Age, which occurred 129.4 million to 125 million years ago during the Cretaceous Period. Rocks of the Barremian Stage overlie those of the Hauterivian Stage and underlie rocks of the Aptian Stage.

The classic type district for rocks of this age is located at Angles, in Alpes-de-Hautes-Provence département in southeastern France, but the stage’s name is derived from localities at nearby Barrême. In northern continental Europe the Barremian Stage is represented by portions of the thick Hils clay, while in England it includes the upper portions of the Wealden sandstones and clays. The base of the stage is generally taken at a point containing the ammonite genus Pseudothurmannia as an index fossil. The Barremian has been divided into several biozones representing shorter spans of time, one of which is characterized by the calcareous nannofossil Nannoconus steinmanni. The planktonic foraminiferan Hedbergella sigali is also an index fossil for rocks of this age.

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