FIG. 5. — A, B in Revised stratigraphic range of the Toarcian ammonite genus Porpoceras Buckman, 1911

FIG. 5. — A, B, Specimens of Porpoceras gr. vortex (Simpson, 1855) -verticosum Buckman, 1914 from the Variabilis Subzone of the Airvault quarry; A, UBGD 279076; B, UBGD 279077; C, specimen UBGD 279075 of Porpoceras gr. vortex-verticosum from the Bifrons Horizon of the Belmont quarry. Scale bars: 10 mm.