Large 82mm rainbow iridescent Caloceras display ammonite fossil 50 The pyrite matrix of this

The pyrite matrix of this piece is full of ammonite shells which all accumulated together on the seafloor in the Early Jurassic

The metallic iron pyrite colour and shine is beautiful

The detail in the worm casts is fantastic and you can even see the openings where the worms would have extended their feeding parts out of the shell

The fossil measures 77 mm (3

The fossil weighs 65 grams and has a cut flat base to allow it to stand freely for display

Large 82mm rainbow iridescent Caloceras display ammonite fossil 50 The pyrite matrix of thisA stunning example of an iridescent ammonite fossil of the species Caloceras johnstoni from North Somerset, UK. The matrix measures 143 mm (5. 65 inches) tall and the ammonite measures 82 mm (3. 2 inches), which is large for this species. The ammonite 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 is very well preserved and has been