Iridescent Caloceras display ammonite with encrusting bivalves 25 The piece of limestone matrix

The piece of limestone matrix measures 95 mm (6

which measures 82 mm (3

and the mottled brown and yellow colour is beautiful and unusual for this species

The fossil consists of several complete crinoids with stems and heads preserved running across the plate with great detail

Iridescent Caloceras display ammonite with encrusting bivalves 25 The piece of limestone matrixA stunning example of an iridescent ammonite fossil of the species Caloceras johnstoni from North Somerset, UK. The matrix measures 87 mm (3. 45 inches) tall and contains a large partial ammonite shell that measures 70 mm across. The shell sits in the original limestone matrix in which it was found that has been shaped and has a cut flat base to allow it to be displayed freely standing. The ammonite shell is very well preserved and has been prepared