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From
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Geolocation
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Author - title
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Year
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| details | Middle Paleocene | Late Paleocene | North Dakota | Nichols,D.J. Biostratigraphy, Williston Basin. In: Resource assement of selected Tertiary coal beds and zone in the northern Rocky Mountains and Great Plains regions. | 1999 |
| details | Pliocene | Pleistocene | Mexico | Martnez-HernЎndez,E. et al. Palynostratigraphy of the Tepexi de Rodriguez Region, Puebla, Mexico; Chronostratigraphic implications]: | 1999 |