A stunning example of an iridescent ammonite fossil of the species Psiloceras planorbis from North Somerset, UK.
The piece of limestone matrix measures 126 mm (5 inches) wide and contains three ammonites, the largest of which measures 65 mm (2.55 inches). The ammonites are well preserved and have been prepared out of the rock to reveal the shells, which display some nice sheens with very subtle iridescent colours. The fossil weighs 155 grams and has a plaster wedge on the back with a cut-flat base to allow it to stand freely for display.
Around 200 million years old (Hettangian, Early Jurassic), this fossil would make a wonderful addition to any collection.