A stunning example of an iridescent ammonite fossil of the species Psiloceras planorbis from North Somerset, UK.
The piece of limestone matrix measures 146 mm (5.8 inches) wide and the ammonite measures 82 mm, which is very large for this genus. The ammonite is well preserved and has been prepared out of the rock to reveal the shell. The shell displays some nice iridescent colours that change depending on the angle that the fossil is viewed at, with some particularly stunning fiery red and orange hues appearing at certain viewing angles and change under different lighting conditions (see photographs). The fossil weighs 525 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.