A stunning example of an iridescent ammonite fossil of the species Psiloceras planorbis from North Somerset, UK.
The piece of limestone matrix measures 125 mm (4.9 inches) across and contains one ammonite, which measures 60 mm, which is large for this species. The ammonite is very well preserved and has been prepared out of the rock to reveal the shell, which displays some nice subtle iridescent colours that change depending on the angle that the fossil is viewed at with a nice silver sheen. The fossil weighs 845 grams and has 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.