Chancia vs Cedaria
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Chancia
Chancia is an extinct genus of Middle Cambrian trilobites classified in the order Ptychopariida and the family Alokistocaridae. Its type species, Chancia ebdome, is from the Glossopleura walcotti Zone of the Spence Shale in Idaho, and other species are recorded from western North America, including British Columbia, Utah, Vermont, and Newfoundland. The genus is used in taxonomic and biostratigraph...
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Cedaria
Cedaria is a genus of Late Cambrian trilobites and the name-bearing taxon for the Cedaria Biozone. This biozone is a biostratigraphic interval used in the correlation of Upper Cambrian rocks, particularly in North America. Cedaria belongs to the ptychopariid branch of trilobite classification and is useful to paleontologists because the presence and distribution of its fossils help identify and co...
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