Lytoceras fimbriatum (J. Sowerby)
Cut and polished section through a nodule. In the centre is a fine calcite preserved Ammonite showing the internal chambers. Tiny Ammonites in cross section are showing in the sediment of the body chamber.
Jurassic, Lower Pliensbachian, Ibex Zone, Charmouth Mudstone Formation, Stonebarrow Marl Member.
Stonebarrow, Charmouth, Dorset.
Ammonite : 4.1 cm diam.