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| details | Aptian | Albian | Volkheimer,W. et al. The oldest angiosperm-palynoflora in Argentina from the type locality of the Lower Cretaceous Huitrin Formation, Neuqu©n Basin; microfloristic association and biostratigraphic significance. | 1975 | |
| details | Aptian | Volkheimer,W. et al. Palynological study of the Huitrin Formation, Cretaceous of the Neuqu©n Basin, and its type locality. | 1976 |