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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 Pliocene | W.Germany(Hesse) | Leschik,G. Microbotanic stratigraphic studies of the Upper Pliocene Browncoal from Buchenau (Hunfeld County). | 1951 | |
| details | Middle Eocene | Colorado | Bradley,W.H. Origin and microfossils of the oil shales of the Green River Formation of Colorado and Utah. | 1931 | |
| details | Middle Eocene | Utah | Bradley,W.H. Origin and microfossils of the oil shales of the Green River Formation of Colorado and Utah. | 1931 |