Sphenodiscus
lenticularis
Phylum
Mollusca, Class Cephalopoda, Subclass
Ammonoidea, Order Ammonitida
Geological
Time: Upper Cretaceous
Size: 50
mm
Fossil
Site: Fox Hills Formation, North Dakota
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This
is a truly remarkable specimen of this Cretaceous ammonite. While
diminutive, the specimen exhibits as much opalescence as I have
ever seen. A greenish-blue dominates the spectrum, with a good dose
of purple.
Also
see: Ammonite Fossils
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