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7 <br /> the Bear Creek site (CA-SJO-0112) (Olsen and Wilson (1964) . <br /> S <br /> dddddd The Windmiller people apparently depended for subsistence on <br /> acorns, as indicated at the known sites by quantities of a <br /> distinctive type of artifact--globs of baked clay--which <br /> archaeologists have interpreted as local substitutes for cooking <br /> stones. Suitable stones or globs of clay were heated in fires <br /> and placed in baskets containing acorn meal, to cook the meal <br /> �'. ,. without exposing the baskets to flame. Repeated exposure to fire <br /> caused the stones and baked clay objects eventually to fracture: <br /> the discarded, thermally-altered fragments form a significant <br /> ry part of the debris found in many Central Valley archaeological <br /> sites. <br /> The known Windmiller sites contain other types of artifacts, <br /> including large projectile points made of obsidian and carefully <br /> polished ground stone implements called "charmstones, " which <br /> apparently had ceremonial significance. Much as been learned <br /> about the Windmiller people (Heizer 1949, 1974 ; Moratto 1984; <br /> Napton 1981; Ragir 1972) but many aspects of this distinctive <br /> culture remain enigmatic (Meighan 1987: 28-36) . <br /> Other archaeological sites in the proposed project region <br /> include the French Camp Slough site (CA-SJO-0091) (Johnson 1970; <br /> Schulz and Johnson 1980) , the Mormon Slough site excavated . by <br /> 4 Fenenga (1970) , and the "Brown" site (CA-SJO-0165) , situated on <br /> the east side of the San Joaquin River, where salvage excavations <br /> were conducted in 1971-72 by field parties from California State <br /> University, Sacramento, directed by J. J. Johnson and reported by <br /> Rolen (1976) . (The balance of the site is reported to have been <br /> destroyed in July 1971, when the mound on which it was situated <br /> was allegedly used as a source of fill for construction of I-5) . <br /> Archaeological investigations in the Stockton-Tracy area <br /> °^. include the work of Jones (1923) and Schenck and Dawson (1929) . <br /> The latter prepared a comprehensive report, one that to this day <br /> constitutes the best available summary of unsponsored excavations <br /> conducted in the numerous mound sites around the Delta region. <br /> The exact locations of some of the sites discussed by Schenck and <br /> a Dawson are obscure--some may never be accurately placed, the <br /> areas in which they are located having been highly altered by <br /> modern agriculture. One of the most recent archaeological <br /> . excavations near Stockton, conducted for research purposes, was a <br /> test of site CA-SJO-0151, undertaken by the writer (Napton 1987) . <br /> I � <br /> Local Archaeological Background <br /> � i <br /> The major local archaeological sequence Pertaining <br /> to the <br /> / Coast Range has been identified by excavation of archaeological <br /> i <br /> t . <br />