• Overbank and channel deposits

• Measured section is 20.5 m from the middle unit of the Cooper Canyon Fm. 0 -> 3.5 m: Dark reddish brown (10R 3/4) silty claystone with light greenish gray (5GY 8/1) very fine reduction mottling. There is a reduced zone about 10 cm thick at the top of the unit, directly underneath the unconformity dividing this unit from the next. Overbank deposits. 3.5 -> 16 m: The base of the unit is a layer of sedimentary rock pebble conglomerate and very coarse sand usually about 1-2 cm thick but up to 10 cm thick, containing bivalves and vertebrate fossils, resting on an unconformable surface. This layer produced the Typothorax osteoderms. The rest is medium reddish brown (10R 4/6) muddy siltstone with large reduction mottles, and thin lenses of muddy sedimentary rock pebble conglomerate and very coarse sand., also containing bivalves and vertebrate fossils. A lens which produced fragmentary metoposaur remains (not collected) is at about 4.8 m, and one producing abundant bivalves is at 5.4 m. This unit also contains gypsum beds, which may be syndepositional. Overbank deposits. 16 -> 20.5 m: Medium reddish brown (10R 4/6) horizontal planar bedded sandstone, mostly very fine to fine grained but becoming coarser in the upper part of the unit, interbedded with sedimentary rock clast granule conglomerate and pebble conglomerate, the latter often very muddy. Channel deposits. Fossils come from the 3.5 -> 16 m interval.