. Bulletins of American paleontology. 64 Bulletin 371. Te\t-figurc 39.—Imperial Fdimation in unnamed, .south-flowing tributary to Super Creek, east of the Whitewater River, northernmost Salton Trough. Steeply dipping to overturned sediments of the Im- perial Formation, including the basal "v^orm ; overlie gra- nitic basement. Patches of finer-grained sands (arrow l yielded \er- tebrae and a mysticete (baleen whale) skull fragment (Thomas and Barnes. 1993). The Bannmg of the San .Andreas Fault Zone is to the sotith (left). Two colleclors (circled) for scale. Photo. E.
. Bulletins of American paleontology. 64 Bulletin 371. Te\t-figurc 39.—Imperial Fdimation in unnamed, .south-flowing tributary to Super Creek, east of the Whitewater River, northernmost Salton Trough. Steeply dipping to overturned sediments of the Im- perial Formation, including the basal "v^orm ; overlie gra- nitic basement. Patches of finer-grained sands (arrow l yielded \er- tebrae and a mysticete (baleen whale) skull fragment (Thomas and Barnes. 1993). The Bannmg of the San .Andreas Fault Zone is to the sotith (left). Two colleclors (circled) for scale. Photo. E. C. Wilson. 2002 Fish CieekA/allecito basin Plate 2. ColLimn 22 (Texl-fiizs. 38, 40. Table 6. Appendices ) Coliinin nu)(Jilied ti\)ni Dibblee (ly^bb); aiea is shown on the following 7'2-niiiuite quadiangles: Haip- er Flat. Boiiego Mountain. Anoyo Tapiado. and Cai- rizo Motintain. California. See also the geologic maps of Winker (1487) and Winker and Kidwell ( 1996). Tcniury Stniilurnphy The Fish Creek/Vallecito Mountains aiea is under- lain by late Ceno/oic units as thick as ni (1 ft), including m ( ft) of exposed Imperial Formation facies and a number of other iniits not pres- ent at the Whitewater River area. The area south of the Fish Creek Mountains and north of the Coyote Mountains includes the Vallecito Badlands, the broad valley of the Cairizo Creek, and the thickest accu- mulation of sediments refened to the Imperial For- mation. Kew (1914) described the Carrizo Creek for- mation here, but his preoccupied name was replaced by the Imperial Ft)rmation. Dibblee (1996b) again des- ignated the area as ". . the most appropriate type sec- tion"" for the Late Miocene-Pliocene Imperial For- matittii. Ahersoii Fomuition. Early to early Middle Mio- cene.—The oldest Cenozoic unit here is the Alverson Forniation. which interfingers with the Split Mountain Formation and is exposed along Fish Creek Wash. As- sociated red beds underlie the v
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