A stunning example of an iridescent ammonite fossil of the species Psiloceras planorbis from North Somerset, UK.
The piece of limestone matrix measures 86 mm (3.4 inches) across and contains a complete ammonite that measures 16 mm (0.6 inches), making this a small juvenile of the species, plus lots of smaller partial shells. It weighs 220 grams.
The ammonite is very well preserved and has been prepared out of the rock to reveal the shell, which displays some stunning iridescent colours that change depending on the angle that the fossil is viewed at with red and copper hues dominating.
The shell sits in the original piece of limestone shale matrix in which it was found that has been shaped and has a cut-flat base that allows it to stand by itself for display.
Around 200 million years old (Hettangian, Early Jurassic), this fossil would make a wonderful addition to any collection. These fossils are preserved in the same way as the more famous Canadian "ammolite", which is turned into valuable gemstones due to the stunning iridescence.