Eurekia vs Elvinia
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Eurekia
Eurekia is an extinct genus of asaphid trilobites placed in the family Eurekiidae. It is known from Late Cambrian and earliest Ordovician marine rocks of Laurentian North America, including the House Range of Utah, Nevada, and the Upper Mississippi Valley. The genus includes species such as Eurekia angustifrons and Eurekia apopsis, and its occurrences help document the transition from Cambrian to...
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Elvinia
Elvinia is a genus of Late Cambrian trilobites known from North America. It belongs to the family Elvinidae and provides the name for the Elvinia Biozone, a biostratigraphic interval used to correlate upper Cambrian rocks. Because the genus is tied to a defined fossil zone, Elvinia is of interest to paleontologists studying the relative age of sedimentary layers, the distribution of Late Cambrian...
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