As a part of continuing studies to provide palynological data from critical sequences for comparative biostratigraphic studies,R. H. Tschudy has analysed the microfossils from a core hole in Mesa County, Colorado. The Parachute Creek Member of the Green River Formation has yielded a fine assemblage of middle Eocene Fossils, including hystrichosphaerids, pteridophyte and fungus spores and gymnosperm and angiosperm pollen.
The samples are from the Collbran Road 1A core hole: sec. 5, T. 11 S., R. 94 W., Mesa County, Colorado.