Abstract
Laetoli preserves a rich Middle Stone Age (MSA) artifact assemblage. We examine basaltic MSA materials collected through surface survey at a number of Laetoli localities, as well as representative samples of nearby volcanic rock exposures (i.e., Ogol Lavas, Lemagurut), using petrographic (mineralogic, textural) and geochemical (major and trace element composition) techniques. Petrographic analysis allows for the informal discrimination of three groups of artifacts based on lithologic criteria (Types A, B, and C). The petrographic basis for these groupings is supported by whole-rock geochemical characteristics. Type C artifacts are readily distinguished from Type A and B artifacts, as well as from local volcanic sources, using both major and trace element data. Type A and B artifacts are more similar in character, and geochemical data suggest that Type A artifacts were likely manufactured from the Ogol Lavas. Type B artifacts share some petrographic and geochemical characteristics with volcanic lavas from Ogol, Lemagurut, and Olmoti, but are not a straightforward match for any single source location. The compositions of Type C artifacts do not match those of any nearby volcanic sources used for comparison in this study, nor do they match published data from other volcanic centers in the region. These data demonstrate that multiple raw material sources were utilized in the manufacture of basaltic MSA artifacts at Laetoli. In addition, the dissimilar petrographic and geochemical features of the MSA artifacts and nearby bedrock exposures indicate more distal sources for the artifacts, despite the local availability of basalt. Raw materials for tool-making might have been transported to the site by streams or by Middle Stone Age hominins.
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Adelsberger, K. A., Wirth, K. R., & Mabulla, A. Z. P. (2002). Provenance of Middle Stone Age tools of the Laetoli archaeological site, Tanzania. Geological Society of America, Abstracts with Programs, 34, 110.
Callow, P. (1994). The Olduvai bifaces: Technology and raw materials. In M. D. Leakey & D. A. Roe (Eds.), Olduvai Gorge (Excavations in Beds III, IV and the Masek Beds, 1968–1971, Vol. 5, pp. 235–253). Cambridge: Cambridge University Press.
Cross, W., Iddings, J. P., Pirsson, L. V., & Washington, H. S. (1903). Quantitative classification of igneous rocks. Chicago: University of Chicago Press.
Dawson, J. B. (1992). Neogene tectonics and volcanicity in the North Tanzania sector of the Gregory rift valley: Contrasts with the Kenya sector. Tectonophysics, 204, pp. 81–92.
Day, M. H., Leakey, M. D., & Magori, C. (1980). A new hominid fossil skull (L.H. 18) from the Ngaloba Beds, Laetoli, northern Tanzania. Nature, 284, pp. 55–56.
Drake, R., & Curtis, G. H. (1987). K–Ar geochronology of the Laetoli fossil localities. In M. D. Leakey & J. M. Harris (Eds.), Laetoli: A Pliocene site in northern Tanzania (pp. 48–52). Oxford: Clarendon.
Greenough, J. D., Gorton, M. P., & Mallory-Greenough, L. M. (2001). The major and trace-element whole-rock fingerprints of Egyptian basalts and the provenance of Egyptian artifacts. Geoarchaeology: An International Journal, 16, pp. 763–784.
Harrison, T., & Kweka, A. (2011). Paleontological localities on the Eyasi Plateau, including Laetoli. In T. Harrison (Ed.), Paleontology and geology of Laetoli: Human evolution in context (Geology, geochronology, paleoecology and paleoenvironment, vol. 1, pp. 99–119). Dordrecht: Springer.
Hay, R. L. (1987). Geology of the Laetoli area. In M. D. Leakey & J. M. Harris (Eds.), Laetoli: A Pliocene site in northern Tanzania (pp. 23–47). Oxford: Clarendon.
Jones, P. R. (1994). Results of experimental work in relation to the stone industries of Olduvai Gorge. In M. D. Leakey & D. A. Roe (Eds.), Olduvai Gorge (Excavations in Beds III, IV and the Masek Beds, 1968–1971, Vol. 5, pp. 254–298). Cambridge: Cambridge University Press.
Kimura, Y. (1999). Tool-using strategies by early hominids at Bed II, Olduvai Gorge, Tanzania. Journal of Human Evolution, 37, pp. 807–831.
Knaack, C., Cornelius, S., & Hooper, P. (1994). Trace element analyses of rocks and minerals by ICP-MS. Department of Geology, GeoAnalytical Laboratory, Pullman, Washington, Open-File Report, Washington State University.
Leakey, M. D. (1981). Discoveries at Laetoli in northern Tanzania. Proceedings of the Geologists’ Association, 92, 81–86.
Leakey, M. D., & Harris, J. M. (1987). Laetoli: A Pliocene site in northern Tanzania. Oxford: Clarendon.
Leakey, M. D., Hay, R. L., Curtis, G. H., Drake, R. E., Jackes, M. K., & White, T. D. (1976). Fossil hominids from the Laetolil beds. Nature, 262, pp. 460–466.
Le Bas, M. J., Le Maitre, R. W., Streckeisen, A., & Zanettin, B. (1986). A chemical classification of volcanic rocks based on the total alkali-silica diagram. Journal of Petrology, 27, pp. 745–750.
Le Maitre, R. W. (Ed.). (1989). A classification of igneous rocks and glossary of terms: Recommendations of the international union of geological sciences subcommission on the systematics of igneous rocks. Oxford: Blackwell.
MacDonald, G. A., & Katsura, T. (1964). Chemical composition of Hawaiian lavas. Journal of Petrography, 5, pp. 82–133.
Magori, C. C., & Day, M. H. (1983). Laetoli Hominid 18: An early Homo sapiens skull. Journal of Human Evolution, 12, pp. 747–753.
Manega, P. C. (1993). Geochronology, geochemistry and isotopic study of the Plio-Pleistocene hominid sites and the Ngorongoro volcanic highland in northern Tanzania. Ph.D. dissertation, University of Colorado, Boulder.
McDonough, W. F., & Sun, S.-S. (1995). The composition of the earth. Chemical Geology, 120, pp. 223–253.
Merrick, H. V., Brown, R. H., & Nash, W. P. (1994). Use and movement of obsidian in the Early and Middle Stone Ages of Kenya and Tanzania. In T. S. Childs (Ed.), Society, culture, and technology in Africa (pp. 29–44). Philadelphia: Museum Applied Science Center for Archaeology.
Mollel, G. F. (2002). Petrology and geochemistry of the southeastern Ngorongoro volcanic highland; and contribution to “sourcing” of stone tools at Olduvai Gorge, Tanzania. M.Sc., Rutgers, The State University of New Jersey, Piscataway.
Mollel, G. E., Ashley, G. M., & Delaney, J. S. (2001). Bulk and mineral compositions from Plio-Pleistocene Ngorongoro Volcanic Highland (NVH), a possible source for stone tool materials at Olduvai Gorge, Tanzania. Geological Society of America, Abstracts with Programs, 33, 295.
Mollel, G. M., Swisher, C., III, & Feigenson, M. (2006). Petrology, geochemistry and 40Ar/39Ar dating of Oldeani volcano, northern Tanzania. Geological Society of America, Abstracts with Programs, 38, 485.
Mollel, G. F., Swisher, C. C., Feigenson, M. D., & Carr, M. J. (2011). Petrology, geochemistry and age of Satiman, Lemagurut and Oldeani: Source of the volcanie deposits of the Laetoli area. In T. Harrison (Ed.), Paleontology and geology of Laetoli: Human evolution in context (Geology, geochronology, paleoecology and paleoenvironment, vol. 1, pp. 99–119). Dordrecht: Springer.
Musiba, C.M. (1999). Laetoli Pliocene paleoecology: A reanalysis via morphological and behavioral approaches. Ph.D. dissertation, University of Chicago, Chicago.
Negash, A., & Shackley, M. S. (2006). Geochemical provenance of obsidian artifacts from the MSA site of Porc Epic, Ethiopia. Archaeometry, 48, pp. 1–12.
Paslick, C., Halliday, A., James, D., & Dawson, J. B. (1995). Enrichment of the continental lithosphere by OIB melts: Isotopic evidence from the volcanic province of northern Tanzania. Earth and Planetary Science Letters, 130, pp. 109–126.
Pickering, R (1964) Geologic map: Endulen, Tanzania. Quarter Degree Sheet 52, Scale: 1:125,000. Dodoma: Tanzania Geological Survey.
Rollinson, H. (1993). Using geochemical data: Evaluation, presentation, and interpretation. New York: Wiley.
Toth, N. (1985). The Oldowan reassessed: A close look at early stone artifacts. Journal of Archaeological Science, 12, pp. 101–120.
Vervoort, J. D., Wirth, K. R., Kennedy, B., Sandland, T., & Harpp, K. S. (2007). The magmatic evolution of the midcontinent rift: New geochronologic and geochemical evidence from felsic magmatism. Precambrian Research, 157, pp. 235–268.
Wirth, K. R., & Adelsberger, K. A. (2002). Mantle source and magmatic evolution of the late Pliocene Ogol Lava beds of Laetoli, Tanzania. Geological Society of America, Abstracts with Programs, 34, 463.
Acknowledgments
This research was conducted with the help and funding of the Associated Colleges of the Midwest Tanzania Program, Beloit College Department of Geology, and Macalester College Department of Geology. Chemical analyses at Macalester College were supported by National Science Foundation (NSF) grants EAR-9601475, DUE-9651385, EAR-0520870, and EAR-9903003. J. Vervoort provided invaluable expertise and guidance on isotopic analyses. In addition, we would like to thank the Tanzanian Department of Antiquities for permits to export scientific samples as well as the University of Dar es Salaam, particularly the Archaeology Unit, for facilitating the ACM program and research requirements. We also wish to thank Simon Kateyo, Said Kilindo, Carl Mendelson, Jeff Thole, Charles Saanane, Carolyn Kilberg, Cameron Davidson, Amy Hubbard, Robert Dymek, Robert Buchwaldt and Jennifer Smith for their help and support, as well as Terry Harrison, Lindsay McHenry, and two anonymous reviewers for their thoughtful comments and suggestions regarding the initial draft of this manuscript. A National Science Foundation Graduate Research Fellowship (to KAA) provided student funding for the writing stages of this project.
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Adelsberger, K.A., Wirth, K.R., Mabulla, A.Z.P., Bowman, D.C. (2011). Geochemical and Mineralogic Characterization of Middle Stone Age Tools of Laetoli, Tanzania, and Comparisons with Possible Source Materials. In: Harrison, T. (eds) Paleontology and Geology of Laetoli: Human Evolution in Context. Vertebrate Paleobiology and Paleoanthropology Series. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9956-3_7
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