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

Paleobotany and Palynology Laboratory, Florida Museum of Natural History, University of Florida, Gainesville, Florida 32611-7800, U.S.A. current address: Department of Biology, Indiana University Southeast, New Albany, Indiana 47150, U.S.A., e-mail: hus{at}ius.edu

DAVID M. JARZEN and DAVID L. DILCHER

Paleobotany and Palynology Laboratory, Florida Museum of Natural History, University of Florida, Gainesville, Florida 32611-7800, U.S.A., e-mail: dmj{at}flmnh.ufl.edu; dilcher{at}flmnh.ufl.edu

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. The new taxa, Cupliferoidaepollenites microscabratus, Dryadopollis minnesotensis, Nyssapollenites microfoveolata, 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 transgressive 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.

Key Words: Late Cretaceous • Cenomanian • Dakota Formation • angiosperm pollen • taxonomy • biostratigraphy • paleoecology