A stunning example of an iridescent calcite multi-ammonite fossil of the species Psiloceras planorbis from North Somerset, UK.
The piece of limestone matrix measures 120 mm (4.75 inches) wide and contains two fossil ammonites. The ammonites are well preserved and have been prepared out of the rock to reveal the whole shells, which display some very subtle iridescent colours that change depending on the angle that the fossil is viewed at. The fossil weighs 370 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.