Early Tertiary sedimentation in the western Uinta Basin, Utah

Stratigraphic and time-stratigraphic cross sections: A north-south transect from near the Uinta Mountain axis across the Basin and Range transition zone to the western margin of the San Rafael Swell, Utah

“…Rocks of the Indianola Group are coarser grained than the time-equivalent rocks (Dakota Sandstone, Mancos Shale, and Mesaverde Group) exposed to the east and the group is informally referred to in this report as the western depositional facies. Correlation of the eastern and western depositional facies is similar to the work of Lawton (1982Lawton ( , 1983Lawton ( , 1985Lawton ( , 1986, Fouch andothers (1982, 1983), and Franczyk and others (1992).…”

“…Some of the stratigraphic units are discussed in regional terms, but this report does not cover the entire Phanerozoic history or the paleogeographic settings of these rocks. Lochman-Balk (1972, 1976 shows that the basal Cambrian quartzite units were time-transgressive from Early Cambrian in the west to Late Cambrian in the east, unconformably onlapping Precambrian strata. The section line for this report generally parallels the time-transgressive shoreline where the basal Cambrian rocks are thought to be mostly Middle Cambrian.…”

“…The pattern of sedimentation within the basin generally was controlled by its proximity to the emerging Sevier orogenic belt and eustatic changes of sea level (Lawton, 1982;Franczyk and others, 1992). The stratigraphic section is dominated by a marine depositional facies in the lower part that grades upward into (and interfingers with) nonmarine depositional facies in the upper part (Lawtoo, 1982(Lawtoo, , 1983(Lawtoo, , 1985(Lawtoo, , 1986Fouch andothers, 1982, 1983;Franczyk and others, 1992). The vertical succession from marine to nonmarine depositional facies is also duplicated laterally as the Cretaceous seas transgressed westward and then retreated in response to the eastward-advancing thrust belt and associated fluvial sedimentation (Franczyk and others, 1992).…”

The effect of drainage reorganization on paleoaltimetry studies: An example from the Paleogene Laramide foreland

“…At the end of the Paleocene, this Lake Flagstaff had expanded into the central Uinta Basin and occupied 150 km length of the foreland along the strike of the fold-thrust belt (See Fig. 1; Ryder et al, 1976;Stanley and Collinson, 1979).…”

“…From Maastrichtian to Late Paleocene time, a major deltaic complex deposited redbeds in the southwestern Uinta Basin (Ryder et al, 1976;Franczyk et al, 1991). Alluvial sand, silt and clay of this system, assigned to the North Horn Formation, were deposited at the margin of the nascent Lake Uinta by east-flowing rivers draining the foldthrust belt, and smaller streams meandering north-northwest from the growing San Rafael Swell (Ryder et al, 1976;Fouch et al, 1983;Lawton, 1986;Franczyk et al, 1991).…”