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Additional Information
The sponges of the extinct genus Choia, are members of Class Desmospongia, Family Choiidae. Choia is a rarer genus of sponge (Phylum Profera) with radiating spines that lived suspended high above the seafloor, attached via stalk-like spines derived from spicules. Their evolutionary range is from the Cambrian until the Lower Ordovician periods. Fossils of Choia have been found in the Burgess Shale in British Columbia; the Maotianshan shales of China; the Wheeler Shale in Utah; and the Lower Ordovician Fezouata formation. It was first described in 1920 by Charles Doolittle Walcott.
The Wheeler Shale formation was named by Charles Doolittle Walcott. The Wheeler is a Konzentrat-Lagerstätte of soft tissued organisms preserved as carbonaceous film on calcareous shale, shaley limestone, mudstone and thin flaggy limestone.
Vendor: FS-JS
SKU Number: SQ5615228
Amecephalus laticaudum from the Middle Cambrian, Spence Shale, Wellsvilles Mtns, Box Elder Co., Utah.
A very rare and complete trilobite.
Full dimensions are listed below.