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Near the south end of the Salinas Valley, marine sandstone beds of the Santa Margarita Formation overlie the Monterey Shale, but farther north the Santa Margarita intertongues with the upper part of the Monterey. The Pancho Rico Formation comprises sandy marine strata and interbedded finer grained rocks that overlie the Santa Margarita near Vineyard Canyon, and generally overlie the Monterey farther north. The nonmarine Paso Robles Formation overlies the Pancho Rico. .Where the Pancho Rico overlies Monterey Shale, the contact is at the base of the stratigraphically lowest sandstone unit above the finer grained rocks typical of the Monterey. Where the Pancho Rico overlies the Santa Margarita, the contact is at the top of the stratigraphically highest beds that contain the giant oyster, Ostrea titan. The upper contact of the Pancho Rico is at the top of the stratigraphically highest lithologic unit that contains marine fossils. The Santa Margarita Formation near Vineyard Canyon contains fossils' indicative of a late Miocene age. The Pancho Rico Formation contains fossil mollusks and echinoids indicative of an early Pliocene age. PREVIOUS STRATIGRAPHIC NOMENCLATURE In most of the southern Salinas Valley, Monterey and San Luis Obispo Counties, Calif, (fig. 1), the Monterey Shale is overlain by sandy marine strata. In the southernmost part of the valley, including the area near the town of Santa Margarita, beds of light-colored massive coarse-grained arkosic, calcareous sandstone that locally contain giant fossil oysters and that overlie the Monterey (fig. 2) are customarily called the Santa Margarita Formation (Fairbanks, 1904, p. 4). Northeast of Vineyard Canyon, similar sandstone beds of the Santa Margarita Formation overlie the Monterey Shale and underlie a unit described by English (1918, p. 229) as a diatomaceous shale member of the Santa Margarita. This diatomaceous shale unit is

Upper Miocene and Pliocene marine stratigraphy in southern Salinas Valley, California