Pleuroceras spinatum Bruguire.
Small chunk of shelly grey siltstone showing the remains of 10 Ammonites. On the upper surface is a fine complete specimen. Developed to the center and with all its original white shell intact. Lovely example of this zonal index Ammonite.
Jurassic, Pliensbachian, Spinatum Zone.
Unterstürmig, Germany.
Complete Ammonite : 4 cm. diam.