Chalard, 1960, p.274: Horizon à Homoceras henkei, sometimes with Retic. circumplicatile, Homocerat. varicatum. Homocerat. demaneti from a bed of H. henkei and R. circumplicatile (see origin see Chalard, pl.C fig.1a). Fosse Heurteau, Fosse Casimir-Périer.