Special Papers in Palaeontology, Nautiloids before and during the origin of ammonoids in a Siluro-Devonian section in the Tafilalt, Anti-Atlas, Morocco

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.