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Author - title
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Year
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| original | Middle Cenomanian | Early Tortonian | Maryland | Groot,J.J. et al. Plant microfossils and age of nonmarine Cretaceous sediments of Maryland and Delaware. | 1960 |
| original | Middle Cenomanian | Early Tortonian | Delaware | Groot,J.J. et al. Plant microfossils and age of nonmarine Cretaceous sediments of Maryland and Delaware. | 1960 |