Stratigraphic distribution of palynomorphs in the Price Canyon and the Wasatch-Gunnison Plateau region, central Utah are reviewed. Three floristic assemblages have been documented, indicating a late Campanian, Maastrichtian, and Lower and Upper Paleocene age for the stratigraphic units in the Price Canyon section. A hiatus (erosional or non-depositional) of several million years duration separates mid-Maastrichtian from early to middle Paleocene strata. Similar gaps in mammalian and reptilian faunas in successive strata of the Wasatch and Gunnison Plateau regions are in accord with the stratigraphic breaks in the palynological record. During early Price River-early North Horn Formation time, palynological data demonstrate the presence of coastal margin, fluvial plain, and braid plain sedimentary environments. Inland lake sedimentation, alternating with broad floodplain environments, indicate interrupted stream-floodplain deposition during early middle Paleocene. Later Paleocene and early Eocene environments were characterized by expanded lake and playa deposition. Stratigraphic deposition of vertebrate fossils in similar strata in the Wasatch and Gunnison Plateau areas, including titanosaurid, ceratopsian, and tyrannosaurid dinosaurs, lizards, crocodilans, and turtles, are present in the lower and middle portions of the North Horn Formation. Above this, mammalian faunas characterize North Horn strata up to about 90 m below the contact with the Flagstaff Limestone Formation. The earliest Paleocene strata are characterized by condylarth-dominated faunal assemblages.

Key words: K-T boundary, North Horn Formation, palynology, Utah