Stratigraphic framework of the Absaroka Volcanic Supergroup in the Yellowstone National Park region

Eocene and Oligocene Floras and Vegetation of the Rocky Mountains

“…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.…”

Field guide to geologic excursions in southwestern Utah and adjacent areas of Arizona and Nevada

“…Where the clasts in the mudflows and the lithologically similar flows are distinctive, the rock units made up of these rocks were mapped separately and given formal or informal names. Where such stratovolcano units were mapped, they commonly were separated into either vent facies or alluvial facies, following the concepts of Parsons (1969) and Smedes and Prostka (1973). The vent facies, as the name implies, consists of deposits that are concentrated near vents and high on volcano flanks, whereas the alluvial facies is concentrated lower on the flanks and beyond the flanks, becoming a grain-supported conglomerate with distance from the source.…”

Isotopic ages and stratigraphy of Cenozoic rocks of the Marysvale volcanic field and adjacent areas, west-central Utah

“…These relatively highly evolved rocks were derived from shallow source cupolas of an underlying batholith; numerous intrusions are currently exposed, emplaced into Bullion Canyon and other volcanic units. Using terminology adapted from Parsons (1965Parsons ( , 1969 and Smedes and Prostka (1973), Anderson and Rowley (1975) applied "vent facies" to rocks deposited in and near sources made up of clustered stratovolcanoes and ''alluvial facies" for more distal flank asemblages. Vent-facies rocks consist mainly of lava flows, autoclastic flow breccia, and volcanic mudflow breccia that were deposited on the slope of a volcanic edifice (stratovolcano), whereas alluvial facies rocks consist of volcanic mudflow breccia, conglomerate, and sandstone deposited farther away on the edifice and in valleys draining the edifice.…”