.93" Iridescent Psiloceras Ammonite - Great Britain

This is a Psiloceras planorbis ammonite fossil from Great Britain. It has a naturally iridescent shell showing nice blues, greens and deep red colors. Like most fossils from the Blue Lias Formation, these ammonites have been compressed and flattened by the same geological processes of heating and pressure which gives them their iridescent shell.