Sedimentary environments a t the Mwanganda site area are reconstructed. Microstratigraphic analyses show that the site was located on the bank of a shallow, braided, paleostream and that bone and artifactual debris were not deposited by paleocurrents, but rather resulted from hominid activity. "his accords with the interpretations of the original excavators of the site. Based on sedimentological studies, it is apparent, however, that the site contents were rearranged by overbank currents that swept across the site at peak discharges. Thus, the distribution pattern of the site contents do not directly reflect hominid meat processing activities that occurred at the site.
INTRODUCTIONMost behavioral activities of Plio-Pleistocene hominids are deduced from the study of cultural materials found as debris accumulations within layers of sediments (Clark, 1970;Leakey, 1971;Isaac, 1967). While examination of the attributes of the materials themselves may allow deduction of the motives of the producers of the materials and/or what the uses of the materials were, analyses of the context and distribution patterns of the materials provide clues about the behavior and/or lifestyle of the site occupants. The latter, however, confronts many problems, for it must be verified that the archaeological materials accumulated purely from hominid activities. Difficulties arise because of problems with archaeological methodology, distortion of activity records by post-occupational, non-hominid related processes, poor resolution in dating and reconstruction of ecological parameters, and non-preservation of data (Efremov, 1940; Schiffer, 1976;Sullivan, 1978;Binford, 1981). Thus, attempts to learn something about early hominid lifestyles from archaeological debris concentrations must adopt multidisciplinary strategies for discerning unequivocable evidence for hominid behavior (Isaac, 1984).The major goal of this paper is to describe and reconstruct the sedimentary environments at and around the Mwanganda Site with the aim of making interpretations of the formation and preservation of the site. Data on sediment types, sedimentary structures, and geometry of the sedimentary units are used to determine the types of sedimentary processes that occurred at the site. An effort is made to determine what effect these processes had on the disposition and distribution of bones and artifacts during and after their burial. The described investigations are purely geological and therefore, the interpreta-