A stunning and perfect example of an iridescent ammonite fossil of the species Caloceras johnstoni from North Somerset, UK.
The matrix measures 130 mm (5.1 inches) tall and the main ammonite measures 80 mm (3.15 inches), which is a good size for this species. 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 is very well preserved, with only a small part of the outer whorl missing, and has been prepared out of the rock to reveal the shell. The shell displays some beautiful multicoloured iridescence with flashes of red, gold, green, and copper that appear as the viewing angle changes.
These fossils are highly sought after and very hard to find, especially complete like this. They are preserved in the same way as the famous Canadian "Ammolite" ammonites that are turned into valuable gemstones. The fossil weighs 775 grams.
Around 200 million years old (Hettangian, Early Jurassic), this fossil would make a wonderful addition to any collection.