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Rare, Unidentified Trilobite with Two Ctenocystoids!
UTAH • OTHER TYPES
Stock Number TTUTX113

Name:   Unidentified Trilobite
Age:  Middle Cambrian
Formation:  Wheeler Formation
Location:  Millard County, Utah
Size:  1.4 inches between trilobite and far Ctenocystoid
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This is a very rare fossil association. It is a Trilobite and TWO Ctenocystis utahensis plate from the Wheeler Shale of Utah. Ctenocystoids are the oldest known echinoderms in the subphylum Homalozoa. The book, "Some Middle Cambrian Fossils of Utah", describes these ctenocystoids - "These tiny, free-living animals are known only from the Spence Shale of Utah." Well, this plate was found in the Wheeler Shale! The ctenocystoids and trilobite are easily seen and are very detailed. The distinct structure of this echinoderms looks like the photo from the book mentioned above (see photo #2). This is a very unique fossil association from the Wheeler Shale.

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