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Geolocation
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Author - title
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Year
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| details | Late Campanian | Early Maastrichtian | Colorado | Johnson,R.C. et al. A study of the Cretaceous-Tertiary unconformity in the Piceance Creek Basin, Colorado--the underlying Ohio Creek Formation (Upper Cretaceous) Aredefined as a Member of the Hunter Canyon or Mesaverde Formation | 1980 |
| details | Middle Albian | Canada(Alberta) | Burden,E.T. et al. Palynomorphs of the Upper Blairmore Group, Southwestern Alberta | 1990 |