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 155 mm (6.1 inches) wide and contains two fossil ammonites, the largest of which measures 61 mm, which is large for this species. The ammonites are well preserved and have been prepared out of the rock to reveal the whole shells. The shell displays some subtle iridescent colours that change depending on the angle that the fossil is viewed at and a nice silvery sheen. The fossil has been backed with a rock-coloured plaster for stability. The fossil weighs 375 grams and has a plaster wedge on the back at the base that has been cut flat 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.