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f . 8 sites at San Luis Dam and Los Banos Reservoir west of the city of Los Banos. These excavations are discussed in detail by Olsen (1970) in his unpublished paper titled "Synthesis of the Archaeology of the Western San Joaquin Valley. " Olsen summarized data from five major excavated archaeological sites. His • y identification of local archaeological complexes depends principally on data obtained from excavation of two sites: CA-MER-0003 and 0094. The other three sites excavated by Olsen (CA-FRE-0128 and -0129, and CA-MER-0014) , are apparently single component sites (Olsen and Payen 1969) . The key site in the Los Banos Reservoir area, in reference to Olsen's research, is CA-MER-0094, which exhibits a minimum of three cultural components. The salient traits of the complexes identified by Olsen are summarized below, arranged in sequence , . from earliest to latest. (Olsen does not provide estimates of the time-span subsumed by each complex. ) Positas Complex: (CA-MER-0094, Grayson Site, Component A) : The earliest complex identified by Olsen, the Positas Complex probably relates to the California Early Horizon. Only a very limited inventory of materials representing this complex is present in the lowest levels of CA-MER-0094. Specimens include ', one-spire ground Olivella bead, a single small bone bead and two projectile points--one leaf-shaped, one stemmed. A few milling stones, cobble pestles, and cobble handstones complete the archaeological inventory. The Positas Complex may also be manifested at a site on Panoche Creek, where Hewes (1941) observed cultural materials buried under eight feet of alluvial and fluvial sediments. Pacheco Complex: (CA-MER-0094 , Components B-1, B-2) : This complex, comparable to the California Middle Horizon, is identified mostly on the basis of shell bead typology. Several types of beads are found in the stratigraphic layers referable to the Pacheco Complex at Site CA-MER-0094. These include thick rectangular Olivella beads, square Haliotis beads, and rectangular beads made of mussel shell. The uppermost levels of the midden contain large and small disc beads, modified saddle beads, and variant thin rectangular Olivella beads. The midden deposit of CA-MER-0094 also contains an extensive inventory of chipped stone artifacts, including large side-notched and stemless projectile points. An economy oriented toward hunting is indicated by the presence of scrapers and other 1 stone tools. Polished stone objects also occur. Groundstone artifacts include large and small bowl mortars, slab milling . bases, and handstones. Burials are oriented in flexed position and are accompanied by frequent grave goods.