Fluvial Architecture of Jurassic Uranium‐Bearing Sandstones, Colorado Plateau, Western United States

Sedimentology of a muddy alluvial deposit: Triassic Denwa Formation, India

“…Several workers (Tyler and Ethridge, 1983;Choi, 1986;O'Brien and Wells, 1986;Smith et al, 1989;Mjos et al, 1993;Jorgensen and Fielding, 1996) have described a number of modern and ancient crevasse splay deposits, which are similar to the sheet bodies described herein. Poorly developed pedogenic features in the sheet complexes and the occurrence of well-developed cumulative paleosols in the surrounding red mudstones (element VIII) highlight the contrast between the rapidly emplaced crevasse splay deposits and the slowly accumulated overbank deposits.…”

Quantification of a Distributive Fluvial System: The Salt Wash DFS of the Morrison Formation, SW U.S.A.

“…Deposits are found primarily at the bases of successions in the Tidwell Member, and only rarely in the overlying more proximal Salt Wash Member. Lacustrine deposits within the Salt Wash are also noted by Peterson (1980Peterson ( , 1984, Tyler and Ethridge (1983), and Kjemperud et al (2008).…”

“…Many have suggested that the Salt Wash DFS was deposited from a dominantly braided fluvial system (Peterson 1977;Tyler and Ethridge 1983;Peterson 1984;Robinson and McCabe 1998), an interpretation that has been based largely on the sand-rich, highly reworked nature of the deposits. Our system-wide study has identified both downstream accretion-and lateral-accretion elements throughout the system, as well as scroll bars in planform, an example of which can be seen in Figure 3A from the proximal to medial portion of the system.…”

“…It is composed of fluvial channel deposits interbedded with floodplain deposits (Craig et al 1955;Mullens and Freeman 1957;Tyler and Ethridge 1983;Peterson 1980Peterson , 1984Peterson , 1988McCabe 1997, 1998;Turner and Peterson 2004;Kjemperud et al 2008;Weissmann et al 2013). It has been described as a fan-shaped fluvial deposit (Craig et al 1955;Mullens and Freeman 1957), which data from this study support ( Fig.…”

The Geology of Fluvial Deposits

“…Both can result in similar lithofacies assemblages and successions (which is one of the problems with vertical profile analysis; see Godin 1991), requiring examination of the architecture and overall context of the deposits in order to arrive at correct interpretations. They may be cut by broad, shallow scours and erosion surfaces of second and third order, indicating stage fluctuations (Harms et al 1963;Harms and Fahnestock 1965;McGowen and Garner 1970;Jackson 1976a;Cant and Walker 1978;Nijman and Puigdefabregas 1978;Plint 1983;Buck 1983;Stear 1983;Tyler and Ethridge 1983;Lawrence and Williams 1987). A brief discussion of some typical examples of the SB element follows.…”