senonian
Se*no"ni*an, a. Etym: [F. sénonien, from the district of Sénonais, in France.] (Geol.) Defn: In european geology, a name given to the middle division of the Upper Cretaceous formation.
Se*no"ni*an, a. Etym: [F. sénonien, from the district of Sénonais, in France.] (Geol.) Defn: In european geology, a name given to the middle division of the Upper Cretaceous formation.