UK Ammonite Sphenodiscus IF-FH-21-001Sphenodiscus lenticularis Fox Hills Formation (Timber Lake Mbr.) Upper Cretaceous (Maastrichtian) Dewey County, South Dakota Seen here is a premier example of the spectacular ammonite Sphenodiscus. Found in limestone concretions, they often have perfectly preserved original aragonite shell that displays fabulous iridescence. This specimen is polished on one side to reveal this feature. The ammonite is 14 inches across its broadest point. Of particular
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