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| details | Barremian | China(Liaoning) | Smith,J.B. et al. Biostratigraphy and avian origins in northeastern China. (In: New Perspectives on the Origin and Early Evolution of Birds: Proceedings of the International Symposium in Honor of John H. Ostrom. J. Gauthier and L. F. Gall, editors) | 2001 | |
| details | Middle Albian | Early Cenomanian | Iraq | Al-Ameri,T.K. et al. Palynostratigraphy and palynofacies indications of depositional environments and source potential for hydrocarbons: the Mid Cretaceous Nahr Umr and lower Mauddud Formations, Iraq. | 2001 |