Lot 656
Russian Aberrant Ammonite. Most ammonites have the familiar tight spiral shape that is so familiar, 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 having only the spiral shape is unknown, but some species did change 70-120 million years ago. This large 9 inch long ammonite from Russia (Ancyloceras matheronianum) is over 100 million years old and has an unusual mostly uncoiled shape that started out with a tight curl and then began in uncoil as it grew larger. This large and spectacular ammonite is nearly complete with just the smallest inner curls missing with its original white mother-of-pearl shell coating fossilizing to an iridescent brown and tan with splashes of white still present. This museum quality and rare ammonite is nicely contrasted against its original black slate matrix.
Allow $20 for domestic shipping.
Estimated Value $1,100 - 1,400.
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