“…As a consequence of the inequities in distribution of fossil floras and nonequivalence in their Smedes & Prostka, 1972Smedes & Prostka, 1972Bown, 1982Bown, 1982Bown, 1982Bown, 1982Bown, 1982Bown, 1982MacGinitie, 1974MacGinitie, 1974Black, 1969Evernden et al, 1964Evernden et al, 1964Mauger, 1977Mauger, 1977MacGinitie, 1974Axelrod, 1987Epis & Chapin, 1975Epis & Chapin, 1975Epis & Chapin, 1975Axelrod, 1966bAxelrod, 1966bAxelrod, 1966bFields et al, 1985Fritz & Harrison, 1985Fritz & Harrison, 1985Fritz & Harrison, 1985Edelman, 1975Edelman, 1975Wolfe & Wehr, 1987Wolfe & Wehr, 1987Wolfe & Wehr, 1987 depositional environments, there are obvious difficulties in interpreting patterns of vegetational and floristic change through time. In spite of these difficulties, a number of durable generalizations have emerged concerning the early Tertiary development of the Rocky Mountain flora.…”