Fig. 53. Triainoceratidae from the Red Ironstone Formation, all reproduced from d in The pharciceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)

Fig. 53. Triainoceratidae from the Red Ironstone Formation, all reproduced from d'Archiac & de Verneuil (1842). A. Sandbergeroceras costatum (d'Archiac & de Verneuil, 1842). B. Sandbergeroceras incertum (d'Archiac & de Verneuil, 1842). C. Sandbergeroceras tuberculosum (d'Archiac & de Verneuil, 1842). Scale bar units = 1 mm.