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Late Cretaceous rocks of Denali National Park and Preserve (Denali), Yukon-Charley Rivers National Preserve (Yukon-Charley), Wrangell-St. Elias National Park and Preserve (Wrangell-St. Elias), and the North Slope of Alaska provide some of the most significant opportunities to examine a regional ancient terrestrial ecosystem in detail. Additionally, paleontological work on similar aged rocks in southwestern Alaska in Aniakchak National Monument has shown that this ecosystem is recorded across the state (Fiorillo and Parrish 2004). This ecosystem supported a rich dinosaurian fauna as well as other fossil vertebrates such as mammals, birds, and fishes (Fiorillo 2006, Gangloff 1998). The floral component of this ecosystem also was diverse and included angiosperms, gymnosperms, and ferns.