Comparisons of Danian Stage relationships of Denmark, the Netherlands, the Gulf Coast and Wyoming reveal two widespread, faunally dated unconformities, sub-Danian and sub-Eocene. The sub-Danian unconformity in the interior of

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North America is not always described as such because of the presence of dinosaur remains above it. This and other fauna indicating Cretaceous affinity in Danian rocks is paralleled by the record of a general continuation of the earlier Cretaceous sedimentary environment. The Danian environment was terminated by Laramide earth movements, and subsequent Eocene Wasatch and Green River formations show a different geographical and stratigraphical development. This is emphsized in traditional European classification which places the Cretaceous-Tertiary boundary at the unconformable Danian-Eocene contact as opposed to American classification which places the boundary at either an unconformable or arbitrary Maestrichtian-Danian contact.

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