Rainbow iridescent Caloceras ammonite fossil with encrusting bivalve shell 38mm crinoid which is small for this

which is small for this fossil type making it a juvenile

These fossils are highly sought after

The ammonite is very well preserved on both sides with highly detailed suture lines and ribs

The fossil weighs 830 grams

Rainbow iridescent Caloceras ammonite fossil with encrusting bivalve shell 38mm crinoid which is small for thisA stunning example of an iridescent ammonite fossil of the species Caloceras johnstoni from North Somerset, UK. The piece of thin limestone matrix measures 128 mm (5. 1 inches) across and contains a single ammonite that measures 38 mm (1. 5 inches), making it a juvenile of this species. The ammonite is very well preserved and has been prepared out of the rock to reveal the shell, which displays some stunning iridescent colours that change depending on