Ammonite

Fossils
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5y
Iridescence Sphenodiscus lenticularis Ammonite
Iridescence Sphenodiscus lenticularis Ammonite Phylum Mollusca, Class Cephalopoda, Subclass Ammonoidea, Order Ammonitida Geological Time: Upper CretaceousSize: 50 mmFossil Site: Fox Hills Formation, North Dakota
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Sphenodiscus lenticularis, Fox Hills Formation, South Dakota. Late Cretaceous (~ 70 mya). Both sides of this handsome specimen display the extraordinarily intricate suture patterns that are characteristic of this species. Also evident is part of the beautifully iridescent nacreous layer. A laterally flattened ammonite, this animal is thought to have been a relatively fast swimmer.
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