This is a preliminary report on Palynmorph zones in early Tertiary strata of the Piceance Creek and Uinta basins of Colorado and Utah. Range zone data have been compounded and reference sections established for the Piceance Creek basin at Government Creek, for the Douglas Creek arch at Cathedral Creek, and for the western Uinta basin at Soldier Summit, Certain taxa appear to be regionally widespread and are used to construct an operational zone of Paleocene to middle Eocene rocks, using informal zones designated Pi through P3 and E1 through E5. Correlation by means of these zones demonstrates the time equivalence of Wasatch and Green River Formations in the Piceance Creek basin to upper North Horn, Flagstaff, Colton, and Green River Formations in the western Uinta basin. Thinning or absence of strata over the Douglas Creek arch is shown to be principally in the Paleocene and earliest Eocene E1 zones, and to a lesser degree in Eocene E2 and E3 zones. Early Paleocene rocks may be absent in the outcrop sections studied.