A big ammonite of the species Harpoceras with a nice color. Additionally there are numerous Dactyliocerates and Eleganticeras ammonites on the backside.

Location: Holzmaden
Epoch/Age: Lower Jurassic, Posidonia Shale, ~ 180 Million years
Size of the stone: 25,5 × 25,6 cm
Size of the fossil (maximal diameter): 23,4 cm