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 150 mm (5.9 inches) wide and contains lots of ammonite shells preserved in a cluster within the matrix. The ammonites are well preserved and have been prepared out of the rock to reveal the whole shells. The shells display some subtle iridescent colours that change depending on the angle that the fossil is viewed at and a nice silvery sheen. The fossil weighs 290 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.