Climatological data from fossil pollen, leaves and wood indicate that the Cretaceous forests of northern Alaska consisted of a mixed canopy that included deciduous conifers with an understory of flowering plants, ferns and cycads.
Climatological data from fossil pollen, leaves and wood indicate that the Cretaceous forests of northern Alaska consisted of a mixed canopy that included deciduous conifers with an understory of flowering plants, ferns and cycads.
由花粉、叶子和木材化石蒐集到的气候资料显示，阿拉斯加北部的白垩纪森林有混合型林冠，包括了落叶针叶林以及林下的开花植物、蕨类和苏铁。