The Jurassic Salt Wash Member of the Momson Formation, southwestern United States, is host to extensive uranium and vanadium mineralization. The ores occur in sandstones deposited in a complex fluvial system. The depositional geometry of the member is that of a wedge-fan. Detailed facies analysis of an area of the mid-paleoslope part of the member (the Slick Rock Uranium District) documents three major sandstone facies interbedded within a sequence of mudstones, siltstones, and thin sandstones.A large-scale trough cross-bedded facies, characterized by broad and generally thin trough crossbeds which rest locally on giant crossbeds as much as 6 m thick and 50 m wide, is the dominant sandstone facies. Paleocurrent azimuths are unimodal and have low consistency ratios indicating little variation in paleocurrent direction. This facies represents deposition in northeast-flowing, low-sinuosity trunk streams. The low-sinuosity streams were confined between leveed banks and probably had low-braiding indexes. Course change was primarily accomplished by avulsion. The second most abundant sandstone facies is primarily characterized by medium-to small-scale trough crossbedded sandstone within lensoid, finingupward cycles. A progressive vertical decrease in the scale of structures and variable paleocurrem orientations are characteristic of these depositional units. This facies represents the point bars of meandering streams that, according to paleocurrent and net sand map evidence, acted as tributaries to the low-sinuosity trunk channels. The third sandstone facies, interpreted as crevasse-splay deposits, contains coarseningupward sandstone packages with variable structures and a distinctive convex geometry.The mudstone, siltstone, and thin sandstone facies averages 50 percent of the member and is subdivided into four subfacies. Oxidized red mudstone with numerous thin, laterally persistent, sandstone and siltstone interbeds represents well-drained floodplain deposits. Less abundant are depositional units composed of calcareous, oxidized silty mudstone with minor sandstone. These units represent sedimentation in shallow ephemeral lakes. Deeper water carbonaceous, gray-green mudstones deposited under anoxic conditions and clay plugs, representing abandoned channel fills, are rare in the district.Detailed analysis of sedimentary facies, sandstone distribution, and regional facies relationships leads to the conclusion that the Salt Wash Member in the Slick Rock District is the product of sedimentation on a fan apron marginal to an alluvial fan or coalesced fan complex. Sandstone thicks that transect the district represent depositional axes of this fluvial system. ~Manuscript