Fig. 1
From: A report on palaeontological excavations and sampling in mudrocks: some guidelines
Exceptional preservation of fossils in mudrocks. Examples from the Lower Jurassic (Hettangian) Schambelen Member of northern Switzerland. a Compressed ammonites (Laqueoceras laqueous (Quenstedt, 1856)) with the shell dissolved but the organic periostracum preserved; b small compressed ammonite (Psiloceras sp.) with a preservation as in a; c ammonite (Waehneroceras sp.), preservation as in a; d organic anaptychus; e: organic lower jaw of a cephalopod; f beetle; g forewings (elytra) of a beetle; h echinoids (Diademopsis heeri Merian in Desor 1858) with articulated spines; i ophiuroid (Ophioderma escheri Heer 1865)