In the Tregor region there are units called Tuffs de Tréguier and Ignimbrites de Lézardrieux.
Born in Radon, Orne, and living most of his life in Lezardrieux, Le Flem studied at the Schola Cantorum under Vincent d'Indy and Albert Roussel, later teaching at the same establishment, where his pupils included Erik Satie and André Jolivet.