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Lot 4454W

Sphenodiscus Ammonite

16 May 2018, 10:00 PDT
Los Angeles

Sold for US$275 inc. premium

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Sphenodiscus Ammonite

Sphenodiscus lenticularis
Cretaceous
Montana

This complete, large 90-million-year-old ammonite, Sphenodiscus lenticularis, was discovered in Montana; it was fossilized when the large inland sea submerged much of Montana. Ammonites, which can be described as a type of armored squid, became extinct 65 million years ago at the same time as the dinosaurs. This beautiful example displays some of its original mother-of-pearl, which has fossilized, exhibiting colors ranging from brown to an iridescent red-orange color. These colors are so prized that gemstones are made from them. Interesting suture patterns (structures which, in life, strengthened the shell) are also seen. The attractive specimen sits upright within a solid stone matrix, making for an excellent display specimen. Measuring 9 1/2in

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