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t fomed the suhsi stence base. Thi s report describes the seasonal activities evident at one of these early sites. A few Anasdzi sites from the f3asketmaker II (pre-A.D. 575) and Basketr.laker III (A.D. 575 to A.D. 800) periods, have beer. located at the Grand Canyon. At TOl'oweap Valley on the ~Iorth Rim, ceramics were found in association with material from which six radiocarbon dates prior to A.n. 34CJ (rlatescorrected as described above) were obtained (Thompson and Thof'lpson 1974:34). Until they are repl icated at other si tes, these dates are considererl suspect. Two of the dates published in this report, one from the early A. D. 400s and one from the fi rst century B.C., ~re from acerarnic contexts. After about ~. D. ROO, several groups occupi ed the Grand Canyon re9i on. More Kayenta Anasazi began movi ng into the eastern secti on of the canyon ~ncl South Rim, and the Cohonina util ized the\oJestern South Rim areas. The Virgin tradition of the Anasazi, defined in the vicinity of Grand Canyon pril'larily by the use of Shinarump and Moapa wares, is evident at sites along the Hestern t-Iorth Rim (Thompson 1970, 1971; Teague and tvlcCl ell an 1978). Hall (1942) and Schwartz, Kepp and Chapman (lqRl) !'lelieve th'is use extended east to Marble Canyon, but this is .based entirely on ceramic evic!ence. Recent analyses by Effland, Jones and F.uler (1981) and Balson (1984), as well as the information presented in this report, substantiate neither of these claims. Population gradllally increased until about A.D. 1100 (Jennings 1971; Effland and Green 1979; Rice, Effland and Blank-Roper 1980; Euler, GumArman,Karlstrom, Oean and Hevly 1979). ,After A.D. 1050, nunbers were 1 a rge enough to \'Iarrant he avy use of the North Ri m primarily for farf'ling (Schwartz, Chapman and' Kepp 1980; Effland, Jones and Euler 1981; Jones 1983b). While agriculture became more important throughout the canyon region :it this time, chapters 11 and 12 of this report suggest that hunting and the gathering of v/ild foods on a seasonal basis were still ir-:oortant. The Cohoni na economy \'/as simil ar, but its range was restricted mostly to the western South Rim, the Esplanade platform on the south side of the canyon and to Havasu Canyon (Eul er and Chand' er 1978; Eul er and Green' 978) . R