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Angiosperms of the Northern Rocky Mountains: Albian to Campanian (Cretaceous) Megafossil Floras

1987; Missouri Botanical Garden; Volume: 74; Issue: 4 Linguagem: Inglês

10.2307/2399448

2162-4372

David R. Crabtree,

Fern and Epiphyte Biology

Synchronous first occurrences of pollen and leaves indicate that angiosperms entered the Northern Rocky Mountain (NRM) region during the Middle Albian, approximately 8 Ma later than such shifts in a from southern Laurasia.The earliest angiosperm pollen and leaf flora Mid s to the P ac sub-Zone IIB in that it poda a pretricolporate palynoflora and a comparable grade of e ee based on leaf rank.The Albia un tanophyll, Protophyll, and Pentalobaphyll mo rphotypes.Sapindophylls are common an flora contains early North American occurrences of the widespread Upper Cretaceous leaf form genera Trochodendroides and Cineman Pentalobaphylls (Araliaephylls) appear early and assume a numerical dominants.Pinnate palms are present by the early Campanian.Higher-level taxa present in the ji cdi in the Ear ly y Campanian include Magnoliales, Laurales, Chloranthales, Nymphaeales, Menisperm Platanaceae, H C agales, Rosidae and sine Dilleniidae.