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From
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To
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Geolocation
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Author - title
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Year
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| details | Late Miocene | Washington | Wolfe,J.A. Paleoclimatic significance of the Oligocene and Neogene floras of the Northwestern United States. | 1981 | |
| details | Lutetian | Wyoming | Leopold,E.B. Pollen and spores of the Kisinger Lakes fossil Leaf locality. (In: An Early Middle Eocene flora from the Yellowstone-Absaroka Volcanic Province Northwestern Wind River Basin, Wyoming. H.D. MacGinitie et al) | 1974 | |
| details | Quaternary | Wyoming | Santucci,V.L. The Yellowstone Paleontological Survey. | 1998 |