Coniacian Stage


Coniacian Stage

      third of six main divisions (in ascending order) in the Upper Cretaceous Series, representing rocks deposited worldwide during the Coniacian Age, which occurred 89.3 to 85.8 million years ago during the Cretaceous Period. Rocks of the Coniacian Stage overlie those of the Turonian Stage and underlie rocks of the Santonian Stage.

      The name for this stage is derived from the town of Cognac in western France. The Coniacian Stage is represented in Britain by part of the Upper Chalk and in the United States by part of the Niobrara Limestone. Conventionally, the base of the stage is defined by the first appearance of the ammonite (ammonoid) Barroisiceras haberfellneri, which is used as an index fossil. The Coniacian has been divided into several shorter spans of time called biozones (biozone), one of which is characterized by the planktonic foraminiferan Whiteinella inornata.

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