Sponge and Trilobite Cambrian Fossils Association

Sponge and Trilobite Assemblage

Choia sp.

Class Demospongia, Subclass Ceractinomorpha, Order Monaxida, Family Choiidae

Peronopsis sp.

Trilobite Order Agnostida, Family Peronopsidae

Geological Time: Middle Cambrian (~520 million years ago)

Size (25.4 mm = 1 inch): Peronopsis: 4 mm long by 2 mm across Choia: 30 mm and 18 mm long by 12 mm across on a 100 mm by 85 mm matrix

Fossil Site: Wheeler Shale, Millard County, Utah

Code: ND008

Price: Sold


Sponge and Trilobite Cambrian Fossils AssociationDescription: This plaque displays a small Agnostid trilobite in association with a spiky sponge known as Choia. Choia lived on the seafloor unattached and filtered food particles from the water. Choia are veryChoia rare in the Burgess Shale, and not very common in Cambrian strata of Utah as well. Sponge fossils from the Cambrian Explosion are found in various Cambrian sites in North America, most notably the Burgess Shale of Canada, and like this specimen in the Cambriian strata of Utah. Many sponges are also described from the Chengjiang biota of China. Sponges are believed to have undergone repeated radiations in the Phanerozoic, and probably attained their largest diversity in the Cretaceous.

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