Dating

Radiometric dating of volcanic tuffs, combined with comparisons with other formations using magnetostratigraphy, using numerous samples from various levels of the formation suggest an age range of 55 - 52 million years ago, placing the Paleocene-Eocene boundary near the base of the formation.

Fossil content

Trace fossils have been found in the Willwood Formation. Fossil birds include Gastornis, Neocathartes

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