Relating to or denoting a geological age or stage of the Cretaceous period, named after Cognac, France.
From Cognac, a town in southwestern France, with the Latin place-name suffix -ian, following geological nomenclature tradition of naming time periods after significant stratotypes.
The Coniacian stage (roughly 89 million years ago) was named after rock formations found near the brandy-famous town of Cognac—a reminder that modern geology's timeline was literally written in French wine country.
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