FIG. 4. — A in Revised stratigraphic range of the Toarcian ammonite genus Porpoceras Buckman, 1911

FIG. 4. — A, Hildoceras sublevisoni Fucini, 1919 (UBGD 279080, Sublevisoni Subzone, Airvault); B-H, Porpoceras gr. vortex (Simpson, 1855) -verticosum Buckman, 1914 (B-E, UBGD 279078, Bifrons Horizon, Airvault; F-H, UBGD 279079, Bifrons Horizon, Airvault); I, Hildoceras bifrons (Bruguière, 1789) (UBGD 279081), Bifrons Horizon, Airvault); J, Haugia variabilis (d'Orbigny, 1844) (UBGD 279082), Variabilis subzone, Airvault). Scale bars: 10 mm.