Russian Aberrant Ammonite
Most ammonites exhibit the familiar tight spiral shape that is so well known, but some ammonites, known as aberrant (heteromorphic) ammonites, began to straighten out, forming a variety of odd, interesting shapes. Why this happened after more than 200 million years of spiral shaped species is unknown, but some species did change 70-120 million years ago. The present large and spectacular ammonite is virtually complete. Its original white mother-of-pearl shell coating has fossilized to an iridescent brown and tan with splashes of white still present.