A stunning example of an iridescent ammonite fossil of the species Caloceras johnstoni from North Somerset, UK.
The matrix measures 102 mm (4 inches) tall and contains three small ammonite shells. The shells sit in the original limestone matrix in which they were found, are well preserved, and have been prepared out of the rock to reveal the details. The shells display some beautiful red and copper iridescence that changes as the viewing angle changes.
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 165 grams and has a cut-flat base to allow it to stand freely for display. 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.