Fig. 9
From: Report on ammonoid soft tissue remains revealed by computed tomography
Additional examples of phosphatized organic remains of ammonoids. a, b Desmoceras sp. (RUB-Pal 11288), Lower Cretaceous (Albian) of Madagascar with the phosphatized siphuncular tube wall preserved. Presence of pyrite framboids indicate anoxic conditions during early diagenesis. c, d Amphipopanoceras sp. (RUB-Pal 11289), Middle Triassic, Spitsbergen (Greenland) with phosphatized pellicle, siphuncular tube wall remains and algae or fungi