Very rare concretion containing an association of trigonias + ammonite. The nodule comes from a quarry closed decades ago.
Ammonite name: Leioceras opalinum
Shell name: Scaphotrigonia navis
Age: Jurassic, Aalenian
Origin: Prinzheim, France
Dimensions: 30 × 24 × 6 cm
Weight: 6.2 kg