6.2 cm Caloceras johnstoni Ammonite Watchet UK
Species: Caloceras johnstoni
Age: Jurassic, Lower Lias, Planorbis Zone
Location: Watchet, Somerset, UK
Ammonite Dimensions: approx. 6.2 cm at widest point
Matrix: 9.3 x 9.2 cm
These decoratively coloured iridescent ammonites change colour depending on the angle of light hitting them.