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Kidwell and Winker (1996) describe the Andrade Member of the Latrania Formation, Imperial Group as a marine progradation (transgression) over the non-marine fanglomerate of their Garnet Formation, Split Mountain Group in the Coyote Mountains (CM). Our detailed mapping in the CM indicates that their Garnet Formation is composed of several (4+) distinct fresh-water fanglomerates. We also have divided their Andrade Member into several (8+) transgression-regressional (T-R) marine (Imperial Group) sequences that bracket some of our fresh-water fanglomerates. The transgressions have a recognizable, predictable and repeated marine sedimentary sequence consisting of a basal conglomerate followed by sandstone and then a mudstone. These marine sedimentary sequences are capped by unconformities representing regressions. Imperial marine sediments interfingers with one of our freshwater fanglomerates. Fresh water limestones are associated with at least two of our fanglomerates. Our fresh-water fanglomerates and T-R marine sequences make up our Viejo Formation (VF).

VIEJO FORMATION: A NEW FORMATION FOR THE IMPERIAL GROUP SEDIMENTS IN THE SOUTHERN COYOTE MOUNTAINS, SALTON TROUGH , SOUTHERN CALIFORNIA