This outcrop is next to Split Mountain in Dinosaur National Monument, Utah, through which the Green River has erosionally carved a prominent canyon (off frame, to the left).
The reddish-colored rocks at left are hematite-rich, fine-grained siliciclastics of the Moenkopi Formation (Lower Triassic). At center & right is the Chinle Formation (Upper Triassic), a multicolored, nonmarine unit consisting of coarse-grained siliciclastics (fluvial channel facies) and fine-grained siliciclastics (floodplain facies). Quartz-permineralized fossil wood is famously common in the Chinle Formation (for example, Petrified Forest National Park in Arizona).
The brown rocks at center are sandstones and conglomerates at the base of the Chinle Formation. This unit is called the Shinarump Member or Shinarump Conglomerate. At Dinosaur National Monument, the unit is also known as the Gartra Member of the Chinle Formation.
Structurally, this is the southern flank of the Split Mountain Anticline, which strikes east-west and plunges westward. This is also the northern flank of the Jensen Syncline.
Stratigraphy: Shinarump Conglomerate (Shinarump Member), lower Chinle Formation, Upper Triassic
Locality: southern flanks of Split Mountain, Dinosaur National Monument, northern Uintah County, northeastern Utah, USA (40° 26' 30.00" North latitude, 109° 14' 55.58" West longitude)
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See info. at:
en.wikipedia.org/wiki/Dinosaur_National_Monument
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Geologic map of Dinosaur National Monument:
pubs.usgs.gov/imap/1407/plate-1.pdf
