Wanneria vs Callavia
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Wanneria
An Early Cambrian olenellid trilobite from North America, among the earliest trilobites recorded in the fossil sequence of the Laurentian continent.
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Callavia
An early Cambrian olenellid trilobite from Newfoundland, Canada, namesake of the Callavia biozone and a key marker for lower Cambrian stratigraphy in Laurentia.
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