Olenellus vs Holmia
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Olenellus
Olenellus is an extinct genus of early trilobite that lived during the Early Cambrian period. Fossils of this primitive arthropod are primarily located in North America and Greenland, where they define the Olenellus biozone of the lower Cambrian. Olenellus lacks facial sutures and features a large, crescent-shaped cephalon with prominent spines. Paleontologists use this index fossil to correlate t...
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Holmia
Holmia is a genus of olenellid trilobites from the early Cambrian Period. It is particularly associated with Scandinavia and nearby parts of the Baltic region. The genus gives its name to the Holmia Biozone, a biostratigraphic interval used to correlate lower Cambrian rocks in parts of northern Europe and adjacent regions. Holmia is important to studies of early trilobite evolution, Cambrian marin...
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