A study of the stratigraphical occurrences of non–ammonoid cephalopods in the Late–Silurian–Middle Devonian. More than 2000 cephalopod specimens were collected from a section in the Tafilalt of south–east Morocco for the study. For the first time, non–ammonoid cephalopod occurrences were recorded against a precisely controlled stratigraphical record in post–Lochkovian Devonian sediments. Includes 16 plates and 23 text–figures.
