Iridescent Caloceras display ammonite with encrusting bivalves 25 and the mottled brown and

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

A great example of the species and impressive in the flesh

This one is unusual as it also has several bivalve shells and serpulid worm tubes/casts that encrusted the ammonite after it died and lay resting on the Jurassic seafloor

which measures 82 mm (3

Iridescent Caloceras display ammonite with encrusting bivalves 25 and the mottled brown andA 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