A stunning example of an iridescent ammonite fossil of the species Caloceras johnstoni from North Somerset, UK.
The matrix measures 152 mm (6 inches) wide and the partial ammonite measures 48 mm. The shell sits in the original limestone matrix in which it was found that has a flat base that allows it to be displayed freely standing. The ammonite is very well preserved and has been prepared out of the rock to reveal the shell. The shell displays some beautiful striking bright green iridescence that changes as the viewing angle changes. Green is the most sought-after colour on these fossils and this is as good as the colour gets.
These fossils are highly sought after and very hard to find. They are preserved in the same way as the famous Canadian "Ammolite" ammonites that are turned into valuable gemstones. The fossil weighs 690 grams. These fossils make great unusual gifts and each one is totally unique.
Around 200 million years old (Hettangian, Early Jurassic), this fossil would make a wonderful addition to any collection.