FIG. 3. — A in Revised stratigraphic range of the Toarcian ammonite genus Porpoceras Buckman, 1911

FIG. 3. — A, Stratigraphic succession of Middle Toarcian beds in the Airvault quarry; B, close-up view of the upper part of the Variabilis subzone in the Airvault quarry, with a Porpoceras specimen (UBGD 279076, see Fig. 5A) in situ indicated with a circle.