A stunning example of an iridescent ammonite fossil of the species Psiloceras planorbis from North Somerset, UK.
The piece of limestone matrix measures 98 mm (3.86 inches) wide and the ammonite measures 37 mm, which is large for this genus. The ammonite is well preserved and has been prepared out of the rock to reveal the shell with part of the outer whorl missing as it was outside of the matrix. The shell displays some nice iridescent colours that change depending on the angle that the fossil is viewed at, with some particularly nice fiery red and orange hues at certain viewing angles. The fossil weighs 150 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.