Large iridescent double-Psiloceras ammonite display fossil Marine reptile It is an unusual example

It is an unusual example as it has a bivalve shellfish resembling an oyster that attached itself to the shell either in life or after the ammonite died and the shell came to rest on the seafloor

which likely occurred during the fossilisation process

It is slightly distorted and compressed on one side

The shell displays some truly stunning multi-coloured iridescence with flashes of red

Large iridescent double-Psiloceras ammonite display fossil Marine reptile It is an unusual exampleA stunning example of an iridescent ammonite fossil of the species Psiloceras planorbis from North Somerset, UK. The piece of limestone matrix measures 140 mm (5. 45 inches) across and contains two complete ammonites, which measure 46 mm and 23 mm. The ammonites are very well preserved and have been prepared out of the rock to reveal the shells, which display some subtle iridescent colours that change depending on the angle that the fossil is viewed