Characterising the stone artefact raw materials at Liang Bua, Indonesia

Sam C. Lin1, Lloyd T. White2, Jatmiko Jatmiko3, I Made Agus Julianto4, Matthew W. Tocheri1,4,5, Thomas Sutikna1
1Australian Research Council Centre of Excellence for Australian Biodiversity and Heritage, University of Wollongong, Wollongong, Australia
2GeoQuEST Research Centre, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, Australia
3Pusat Riset Arkeologi Prasejarah Dan Sejarah, Badan Riset Dan Inovasi Nasional, Jakarta, Indonesia
4Department of Anthropology, Lakehead University, Thunder Bay, Canada
5Human Origins Program, National Museum of Natural History, Smithsonian Institution, Washington, USA

Tóm tắt

Abstract At Liang Bua, the type site of Homo floresiensis on the Indonesian island of Flores, the stone artefact assemblages are dominated by two raw materials, qualitatively classified as chert and silicified tuff in previous studies. Field observations describe both stone types as locally abundant and of good flaking quality, but no systematic analysis has yet been carried out to characterise their nature. In this study, we conducted the first geological, mechanical, and quantitative assessment of these two raw materials using a suite of analytical approaches. Our results show that the two stone types are mineralogically alike in composition and derive from fossiliferous limestone that had undergone diagenetic silica replacement, but they clearly differ from one another geochemically. Therefore, the ‘chert’ and ‘silicified tuff’ categories used in previous studies are more aptly described as silica-dominated (i.e., SiO2-dominated) nodular chert and iron-rich (i.e., Fe2O3-rich) nodular chert, respectively. We discuss the implications of our results on the shift in raw material utilisation patterns at Liang Bua that occurred after ~ 46 ka and coincided with the arrival of Homo sapiens at the site.

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Tài liệu tham khảo

Abrunhosa, A., Pereira, T., Márquez, B., Baquedano, E., Arsuaga, J. L., & Pérez-González, A. (2019). Understanding Neanderthal technological adaptation at Navalmaíllo Rock Shelter (Spain) by measuring lithic raw materials performance variability. Archaeological and Anthropological Sciences, 11, 5949–5962. https://doi.org/10.1007/s12520-019-00826-3

Aldeeky, H., Al Hattamleh, O., & Rababah, S. (2020). Assessing the uniaxial compressive strength and tangent Young’s modulus of basalt rock using the Leeb rebound hardness test. Materiales De Construcción, 70(340), e230. https://doi.org/10.3989/MC.2020.15119

Andrefsky, W. (1994). Raw-material availability and the organization of technology. American Antiquity, 59(1), 21–34. https://doi.org/10.2307/3085499

Banning, E. B. (2021). Sampled to death? The rise and fall of probability sampling in archaeology. American Antiquity, 86(1), 43–60. https://doi.org/10.1017/aaq.2020.39

Ben Ghorbal, G., Tricoteaux, A., Thuault, A., Louis, G., & Chicot, D. (2017). Comparison of conventional Knoop and Vickers hardness of ceramic materials. Journal of the European Ceramic Society, 37(6), 2531–2535. https://doi.org/10.1016/j.jeurceramsoc.2017.02.014

Blatt, H., & Tracy, R. (1996). Petrology: Igneous, sedimentary, and metamorphic. Freeman.

Boggs, S. J. (2009). Petrology of sedimentary rocks. Cambridge University Press.

Brantingham, P. J. (2006). Measuring forager mobility. Current Anthropology, 47(3), 435–459. https://doi.org/10.1086/503062

Brantingham, P. J., Olsen, J. W., Rech, J. A., & Krivoshapkin, A. I. (2000). Raw material quality and prepared core technologies in Northeast Asia. Journal of Archaeological Science, 27(3), 255–271. https://doi.org/10.1006/jasc.1999.0456

Braun, D. R., Plummer, T., Ferraro, J. V., Ditchfield, P., & Bishop, L. C. (2009). Raw material quality and Oldowan hominin toolstone preferences: Evidence from Kanjera South. Kenya. Journal of Archaeological Science, 36(7), 1605–1614. https://doi.org/10.1016/j.jas.2009.03.025

Brown, P., & Maeda, T. (2009). Liang Bua Homo floresiensis mandibles and mandibular teeth: A contribution to the comparative morphology of a new hominin species. Journal of Human Evolution, 57(5), 571–596. https://doi.org/10.1016/j.jhevol.2009.06.002

Brown, P., Sutikna, T., Morwood, M. J., Soejono, R. P., Jatmiko, W. S., & E., & Rokus Awe Due,. (2004). A new small-bodied hominin from the Late Pleistocene of Flores, Indonesia. Nature, 431, 1055–1061. https://doi.org/10.1038/nature02999

Brumm, A., Aziz, F., van den Bergh, G. D., Morwood, M. J., Moore, M. W., Kurniawan, I., Hobbs, D. R., & Fullagar, R. (2006). Early stone technology on Flores and its implications for Homo floresiensis. Nature, 441, 624–628. https://doi.org/10.1038/nature04618

Brumm, A., Jensen, G. M., van den Bergh, G. D., Morwood, M. J., Kurniawan, I., Aziz, F., & Storey, M. (2010). Hominins on Flores, Indonesia, by one million years ago. Nature, 464, 748–752. https://doi.org/10.1038/nature08844

Brumm, A., van den Bergh, G. D., Storey, M., Kurniawan, I., Alloway, B. V., Setiawan, R., Setiyabudi, E., Grün, R., Moore, M. W., Yurnaldi, D., Puspaningrum, M. R., Wibowo, U. P., Insani, H., Sutisna, I., Westgate, J. A., Pearce, N. J. G., Duval, M., Meijer, H. J. M., Aziz, F., … Morwood, M. J. (2016). Age and context of the oldest known hominin fossils from Flores. Nature, 534, 249–253. https://doi.org/10.1038/nature17663

Calandra, I., Gneisinger, W., & Marreiros, J. (2020). A versatile mechanized setup for controlled experiments in archeology. STAR: Science & Technology of Archaeological Research, 6, 30–40. https://doi.org/10.1080/20548923.2020.1757899

Çelik, S. B., & Çobanoğlu, İ. (2019). Comparative investigation of Shore, Schmidt, and Leeb hardness tests in the characterization of rock materials. Environmental Earth Sciences, 78, 554. https://doi.org/10.1007/s12665-019-8567-7

Egeland, C. P., Fadem, C. M., Byerly, R. M., Henderson, C., Fitzgerald, C., Mabulla, A. Z., Baquedano, E., & Gidna, A. (2019). Geochemical and physical characterization of lithic raw materials in the Olduvai Basin, Tanzania. Quaternary International, 526, 99–115. https://doi.org/10.1016/j.quaint.2019.09.036

Erickson, L. C., Hawthorne, H. M., & Troczynski, T. (2001). Correlations between microstructural parameters, micromechanical properties and wear resistance of plasma sprayed ceramic coatings. Wear, 250(1–12), 569–575. https://doi.org/10.1016/S0043-1648(01)00608-1

Falk, D., Hildebolt, C., Smith, K., Morwood, M. J., Sutikna, T., Brown, P., Jatmiko, W. S., & E., Brunsden, B., & Prior, F. (2005). The brain of LB1, Homo floresiensis. Science, 308(5719), 242–245. https://doi.org/10.1126/science.1109727

Gauthier, G., Burke, A. L., & Leclerc, M. (2012). Assessing XRF for the geochemical characterization of radiolarian chert artifacts from northeastern North America. Journal of Archaeological Science, 39(7), 2436–2451. https://doi.org/10.1016/j.jas.2012.02.019

Grave, P., Attenbrow, V., Sutherland, L., Pogson, R., & Forster, N. (2012). Non-destructive pXRF of mafic stone tools. Journal of Archaeological Science, 39(6), 1674–1686. https://doi.org/10.1016/j.jas.2011.11.011

Hall, G. E. M., Bonham-Carter, G. F., & Buchar, A. (2014). Evaluation of portable X-ray fluorescence (pXRF) in exploration and mining: Phase 1, control reference materials. Geochemistry: Exploration. Environment, Analysis, 14, 99–123. https://doi.org/10.1144/geochem2013-241

Harahap, B. H., Abidin, H. Z., Utoyo, H., Djumhana, D., & Yuniarni, R. (2015). Prospect of mineral deposits in the central Flores Island, Eastern Indonesia. Jurnal Geologi Dan Sumberdaya Mineral, 16(1), 1–13.

Hayes, E., Fullagar, R., Kamminga, J., Prinsloo, L. C., Bordes, L., Sutikna, T., Tocheri, M. W., Wahyu Saptomo, E., Jatmiko, & Roberts, R. G. (2021). Use-polished stone flakes from Liang Bua, Indonesia: Implications for plant processing and fibrecraft in the Late Pleistocene. Journal of Archaeological Science: Reports, 40(A), 103199. https://doi.org/10.1016/j.jasrep.2021.103199

Inkscape Project (2020). Inkscape. https://inkscape.org

Jungers, W. L., Harcourt-Smith, W. E., Wunderlich, R. E., Tocheri, M. W., Larson, S. G., Sutikna, T., Due, R. A., & Morwood, M. J. (2009a). The foot of Homo floresiensis. Nature, 459, 81–84. https://doi.org/10.1038/nature07989

Jungers, W. L., Larson, S. G., Harcourt-Smith, W., Morwood, M. J., Sutikna, T., Due, R. A., & Djubiantono, T. (2009b). Descriptions of the lower limb skeleton of Homo floresiensis. Journal of Human Evolution, 57(5), 538–554. https://doi.org/10.1016/j.jhevol.2008.08.014

Kaifu, Y., Baba, H., Sutikna, T., Morwood, M. J., Kubo, D., Wahyu Saptomo, E., & JatmikoDue, & Djubiantono, T., R. A. (2011). Craniofacial morphology of Homo floresiensis: Description, taxonomic affinities, and evolutionary implication. Journal of Human Evolution, 61(6), 644–682.

Kaifu, Y., Kono, R. T., Sutikna, T., Wahyu Saptomo, E., & Due, R. A. (2015a). Unique dental morphology of Homo floresiensis and its evolutionary implications. PLoS ONE, 10(11), e0141614.

Kaifu, Y., Kono, R. T., Sutikna, T., Wahyu Saptomo, E., Due, R. A., & Baba, H. (2015b). Descriptions of the dental remains of Homo floresiensis. Anthropological Science, 123(2), 129–145. https://doi.org/10.1537/ase.150501

Key, A. J. M. (2016). Integrating mechanical and ergonomic research within functional and morphological analyses of lithic cutting technology: Key principles and future experimental directions. Ethnoarchaeology, 8(1), 69–89. https://doi.org/10.1080/19442890.2016.1150626

Key, A., Proffitt, T., & de la Torre, I. (2020). Raw material optimization and stone tool engineering in the Early Stone Age of Olduvai Gorge (Tanzania). Journal of the Royal Society Interface, 17(162), 20190377. https://doi.org/10.1098/rsif.2019.0377

Koesoemadinata, S., Noya, Y., & Kadarisman, D. (1994). Geological map of the Ruteng Quadrangle, Nusa Tenggara, scale 1:250,000. Geological Research and Development Center, Indonesia.

Larson, S. G., Jungers, W. L., Tocheri, M. W., Orr, C. M., Morwood, M. J., Sutikna, T., Awe, R. D., & Djubiantono, T. (2009). Descriptions of the upper limb skeleton of Homo floresiensis. Journal of Human Evolution, 57(5), 555–570. https://doi.org/10.1016/j.jhevol.2008.06.007

Lemorini, C., Bishop, L. C., Plummer, T. W., Braun, D. R., Ditchfield, P. W., & Oliver, J. S. (2019). Old stones’ song—Second verse: Use-wear analysis of rhyolite and fenetized andesite artifacts from the Oldowan lithic industry of Kanjera South, Kenya. Archaeological and Anthropological Sciences, 11, 4729–4754. https://doi.org/10.1007/s12520-019-00800-z

Lin, S. C., & Premo, L. S. (2021). Forager mobility and lithic discard probability similarly affect the distance of raw material discard from source. American Antiquity, 86(4), 845–863. https://doi.org/10.1017/aaq.2021.66

Lin, S. C., Rezek, Z., & Dibble, H. L. (2018). Experimental design and experimental inference in stone artifact archaeology. Journal of Archaeological Method and Theory, 25(3), 663–688. https://doi.org/10.1007/s10816-017-9351-1

Maliva, R. G., & Siever, R. (1989). Nodular chert formation in carbonate rocks. The Journal of Geology, 97(4), 421–433. https://doi.org/10.1086/629320

Malyk-Selivanova, N., Ashley, G. M., Gal, R., Glascock, M. D., & Neff, H. (1998). Geological–geochemical approach to “sourcing” of prehistoric chert artifacts, northwestern Alaska. Geoarchaeology, 13(7), 673–708. https://doi.org/10.1002/(SICI)1520-6548(199810)13:7%3c673::AID-GEA2%3e3.0.CO;2-3

Marwick, B., Clarkson, C., O’Connor, S., & Collins, S. (2016). Early modern human lithic technology from Jerimalai, East Timor. Journal of Human Evolution, 101, 45–64. https://doi.org/10.1016/j.jhevol.2016.09.004

McPherron, S. P., Braun, D. R., Dogandžić, T., Archer, W., Desta, D., & Lin, S. C. (2014). An experimental assessment of the influences on edge damage to lithic artifacts: A consideration of edge angle, substrate grain size, raw material properties, and exposed face. Journal of Archaeological Science, 49, 70–82. https://doi.org/10.1016/j.jas.2014.04.003

Moore, M. W. (2007). Lithic design space modelling and cognition in Homo floresiensis. In A. C., Schalley, & D. Khlentzos (Eds.), Mental stages, volume 1: Evolution, function, and nature (pp. 11–34). John Benjamins Publishing Company

Moore, M. W., & Brumm, A. (2007). Stone artifacts and hominins in island Southeast Asia: New insights from Flores, eastern Indonesia. Journal of Human Evolution, 52(1), 85–102. https://doi.org/10.1016/j.jhevol.2006.08.002

Moore, M. W., & Brumm, A. (2009). Homo floresiensis and the African Oldowan. In E. Hovers & D. R. Braun (Eds.), Interdisciplinary approaches to the Oldowan: Vertebrate paleobiology and paleoanthropology (pp. 61–69). Springer. https://doi.org/10.1007/978-1-4020-9060-8

Moore, M. W., Sutikna, T., Jatmiko, M., & M. J., & Brumm, A. (2009). Continuities in stone flaking technology at Liang Bua, Flores. Indonesia. Journal of Human Evolution, 57(5), 503–526. https://doi.org/10.1016/j.jhevol.2008.10.006

Morley, M. W., Goldberg, P., Sutikna, T., Tocheri, M. W., Prinsloo, L. C., Jatmiko, W. S., & E., Wasisto, S., & Roberts, R. G. (2017). Initial micromorphological results from Liang Bua, Flores (Indonesia): Site formation processes and hominin activities at the type locality of Homo floresiensis. Journal of Archaeological Science, 77, 125–142. https://doi.org/10.1016/j.jas.2016.06.004

Morwood, M. J., Brown, P., Jatmiko, S., & T., Wahyu Saptomo, E., Westaway, K. E., Rokus Awe Due, Roberts, R. G., Maeda, T., Wasisto, S., & Djubiantono, T. (2005). Further evidence for small-bodied hominins from the Late Pleistocene of Flores, Indonesia. Nature, 437, 1012–1017. https://doi.org/10.1038/nature04022

Morwood, M. J., Soejono, R. P., Roberts, R. G., Sutikna, T., Turney, C. S. M., Westaway, K. E., Rink, W. J., Zhao, J. X., van den Bergh, G. D., Due, R. A., Hobbs, D. R., Moore, M. W., Bird, M. I., & Fifield, L. K. (2004). Archaeology and age of a new hominin from Flores in eastern Indonesia. Nature, 431, 1087–1091. https://doi.org/10.1038/nature02956

Morwood, M. J., Sutikna, T., Saptomo, E. W., Jatmiko, H., & D. R., & Westaway, K. E. (2009). Preface: Research at Liang Bua, Flores. Indonesia. Journal of Human Evolution, 57(5), 437–449. https://doi.org/10.1016/j.jhevol.2009.07.003

Murray, R. W. (1994). Chemical criteria to identify the depositional environment of chert: General principles and applications. Sedimentary Geology, 90(3–4), 213–232. https://doi.org/10.1016/0037-0738(94)90039-6

Namen, A., Iovita, R., Nickel, K. G., Varis, A., Taimagambetov, Z., & Schmidt, P. (2022). Mechanical properties of lithic raw materials from Kazakhstan: Comparing chert, shale, and porphyry. PLoS ONE, 17, e0265640.

Nanlohy, F., Sitorus, K., Kasbani, D., & S., & Simanjuntak, J. (2002). Subsurface geology of the Mataloko geothermal field deduced from MTL-1, MT-1 and MT-2 wells, central Flores, East Nusa Tenggara, Indonesia. Bulletin of the Geological Survey of Japan, 53(2/3), 329–336. https://doi.org/10.9795/bullgsj.53.329

Newlander, K., Goodale, N., Jones, G. T., & Bailey, D. G. (2015). Empirical study of the effect of count time on the precision and accuracy of pXRF data. Journal of Archaeological Science: Reports, 3, 534–548. https://doi.org/10.1016/j.jasrep.2015.07.007

Noll, M. P. (2000). Components of Acheulian lithic assemblage variability at Olorgesailie, Kenya. Unpublished Ph.D. dissertation, University of Illinois at Urbana-Champaign.

Oestmo, S., Janssen, M. A. & Marean, C. W. (2016). Testing Brantingham’s neutral model: The effect of spatial clustering on stone raw material procurement. In J. A. Barceló, & F. Del Castillo (Eds.), Simulating prehistoric and ancient worlds (pp. 175–188). Springer. https://doi.org/10.1007/978-3-319-31481-5_4

Pop, C. M. (2016). Simulating lithic raw material variability in archaeological contexts: A re-evaluation and revision of Brantingham’s neutral model. Journal of Archaeological Method and Theory, 23, 1127–1161. https://doi.org/10.1007/s10816-015-9262-y

Pop, C. M., Wilson, L., & Browne, C. L. (2022). Evaluating landscape knowledge and lithic resource selection at the French Middle Paleolithic site of the Bau de l’Aubesier. Journal of Human Evolution, 166, 103152. https://doi.org/10.1016/j.jhevol.2022.103152

QGIS Development Team (2022). QGIS Geographic Information System. Open Source Geospatial Foundation. http://qgis.org

R Core Team (2021). R: A language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. https://www.R-project.org/.

Schneider, C. A., Rasband, W. S., & Eliceiri, K. W. (2012). NIH Image to ImageJ: 25 years of image analysis. Nature Methods, 9, 671–675. https://doi.org/10.1038/nmeth.2089

Seong, C. (2004). Quartzite and vein quartz as lithic raw materials reconsidered: A view from the Korean paleolithic. Asian Perspectives, 43(1), 73–91. https://doi.org/10.1353/asi.2004.0016

Sheppard, P. J., Irwin, G. J., Lin, S. C., & McCaffrey, C. P. (2011). Characterization of New Zealand obsidian using PXRF. Journal of Archaeological Science, 38(1), 45–56. https://doi.org/10.1016/j.jas.2010.08.007

Sheppard, P. J., & Pavlish, L. A. (1992). Weathering of archaeological cherts: A case study from the Solomon Islands. Geoarchaeology, 7(1), 41–53. https://doi.org/10.1002/gea.3340070104

Sherwood, N., 2019. Analyzing lithic raw material qualities and hominid selectivity in the Early Palaeolithic. Unpublished Ph.D. dissertation, University of the Witwatersrand.

Shipton, C., O’Connor, S., Jankowski, N., O’Connor-Veth, J., Maloney, T., Kealy, S., & Boulanger, C. (2019). A new 44,000-year sequence from Asitau Kuru (Jerimalai), Timor-Leste, indicates long-term continuity in human behaviour. Archaeological and Anthropological Sciences, 11, 5717–5741. https://doi.org/10.1007/s12520-019-00840-5

Sutikna, T., Tocheri, M. W., Faith, J. T., Jatmiko, R. D., Awe, M., & H. J. M., Wahyu Saptomo, E., & Roberts, R. G. (2018). The spatio-temporal distribution of archaeological and faunal finds at Liang Bua (Flores, Indonesia) in light of the revised chronology for Homo floresiensis. Journal of Human Evolution, 124, 52–74. https://doi.org/10.1016/j.jhevol.2018.07.001

Sutikna, T., Tocheri, M. W., Morwood, M. J., Wahyu Saptomo, E., Jatmiko, R. D., Awe, W., & S., Westaway, K. E., Aubert, M., Li, B., Zhao, J. -x., Storey, M., Alloway, B. V., Morley, M. W., Meijer, H. J. M., van den Bergh, G. D., Grün, R., Dosseto, A., Brumm, A., Jungers, W. L., & Roberts, R. G. (2016). Revised stratigraphy and chronology for Homo floresiensis at Liang Bua in Indonesia. Nature, 532, 366–369. https://doi.org/10.1038/nature17179

Tocheri, M. W., Larson, S. G., Sutikna, T., Jatmiko, E., Wahyu Saptomo, E., Due, R. A., Djubiantono, T., Morwood, M. J., & Jungers, W. L. (2007). The primitive wrist of Homo floresiensis and its implications for hominin evolution. Science, 317, 1743–1745. https://doi.org/10.1126/science.1147143

Tocheri, M. W., Veatch, E. G., Jatmiko, Wahyu Saptomo, E., & Sutikna, T. (2022). Homo floresiensis. In C. F. W. Higham & N. C. Kim (Eds.), The Oxford handbook of early Southeast Asia (pp. 38–69). Oxford University Press. https://doi.org/10.1093/oxfordhb/9780199355358.001.0001

Toraya, H. (2016). A new method for quantitative phase analysis using X-ray powder diffraction: Direct derivation of weight fractions from observed integrated intensities and chemical compositions of individual phases. Journal of Applied Crystallography, 49, 1508–1516. https://doi.org/10.1107/S1600576716010451

Wang, Y., Grammer, G. M., Eberli, G., Weger, R., & Nygaard, R. (2022). Testing rebound hardness for estimating rock properties from core and wireline logs in mudrocks. Journal of Petroleum Science and Engineering, 210, 109973. https://doi.org/10.1016/j.petrol.2021.109973

Westaway, K. E., Roberts, R. G., Sutikna, T., Morwood, M. J., Drysdale, R., Zhao, J., & x., & Chivas, A.R. (2009). The evolving landscape and climate of western Flores: An environmental context for the archaeological site of Liang Bua. Journal of Human Evolution, 57(5), 450–464. https://doi.org/10.1016/j.jhevol.2009.01.007

White, A. (2021). Lithic transport patterns, tool curation behavior, and group range estimates: A model-based exploration. Journal of Computer Applications in Archaeology, 4(1), 254–273. https://doi.org/10.5334/jcaa.82

Yaşar, E., & Erdoǧan, Y. (2004). Estimation of rock physicomechanical properties using hardness methods. Engineering Geology, 71(3–4), 281–288. https://doi.org/10.1016/S0013-7952(03)00141-8

Yonekura, K. (2015). Rock properties and material selection for blade manufacture in upper paleolithic Japan. Lithic Technology, 40(2), 85–93. https://doi.org/10.1179/2051618515Y.0000000001

Yonekura, K., Hasegawa, H., Hotta, A., & Suzuki, T. (2008). A novel approach to studies of prehistoric exploitation of stone tool materials using material composition, surface morphology, microstructure and mechanical properties. Archaeometry, 50(5), 727–746. https://doi.org/10.1111/j.1475-4754.2008.00374.x

Yonekura, K., & Suzuki, T. (2009). Microhardness analysis and characterization of Palaeolithic stone tool materials for understanding primary material selections and utilizations. Materials Characterization, 60(4), 282–291. https://doi.org/10.1016/j.matchar.2008.08.008

Zhou, J., Mandal, S., Chen, F., Quest, M., & Hume, D. (2018). Reservoir geomechanic heterogeneity index (RGHI): Concept, methodology, and application. Paper presented at the SPE/AAPG/SEG Unconventional Resources Technology Conference 2018, Houston. https://doi.org/10.15530/urtec-2018-2902828

Veatch, E. G., Tocheri, M. W., Sutikna, T., McGrath, K., Saptomo, E. W., Jatmiko, Helgen, K. M. (2019). Temporal shifts in the distribution of murine rodent body size classes at Liang Bua (Flores Indonesia) reveal new insights into the paleoecology of Homo floresiensis and associated fauna. Journal of Human Evolution 13045–60 S0047248418302239 https://doi.org/10.1016/j.jhevol.2019.02.002