NEW SPECIES OF ANGIOSPERM POLLEN FROM THE DAKOTA FORMATION (CENOMANIAN, UPPER CRETACEOUS) OF MINNESOTA, U.S.A

摘要

Five new species of angiosperm pollen described from three localities in south-central Minnesota support a Cenomanian age for the Dakota Formation in this area Thenew tiLxa.^upliferoidaepollenitesmicroscabratus^ryadopoUisminnesotensis.Nyssapollenitesmicrofoveolata, Phimopollenites striolata, and Tricolpites labeonis, are described using both light and scanning electron microscopy, are easily recognizable, and are useful age indicator species. Because of the extent and transgiessive nature of the Dakota Formation, age determination has been difficult. The new angiosperm pollen species described here may help to support age determination for the Dakota Formation over a broader geographic area.