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An early modern human presence in Sumatra 73,000–63,000 years ago
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Genetic evidence for anatomically modern humans (AMH) out of Africa before 75 thousand years ago (ka) and in island southeast Asia (ISEA) before 60 ka (93-61 ka) predates accepted archaeological records of occupation in the region. Claims that AMH arrived in ISEA before 60 ka (ref. 4) have been supported only by equivocal or non-skeletal evidence. AMH evidence from this period is rare and lacks robust chronologies owing to a lack of direct dating applications, poor preservation and/or excavation strategies and questionable taxonomic identifications. Lida Ajer is a Sumatran Pleistocene cave with a rich rainforest fauna associated with fossil human teeth. The importance of the site is unclear owing to unsupported taxonomic identification of these fossils and uncertainties regarding the age of the deposit, therefore it is rarely considered in models of human dispersal. Here we reinvestigate Lida Ajer to identify the teeth confidently and establish a robust chronology using an integrated dating approach. Using enamel-dentine junction morphology, enamel thickness and comparative morphology, we show that the teeth are unequivocally AMH. Luminescence and uranium-series techniques applied to bone-bearing sediments and speleothems, and coupled uranium-series and electron spin resonance dating of mammalian teeth, place modern humans in Sumatra between 73 and 63 ka. This age is consistent with biostratigraphic estimations, palaeoclimate and sea-level reconstructions, and genetic evidence for a pre-60 ka arrival of AMH into ISEA. Lida Ajer represents, to our knowledge, the earliest evidence of rainforest occupation by AMH, and underscores the importance of reassessing the timing and environmental context of the dispersal of modern humans out of Africa.
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“The hominin fossil record of Island Southeast Asia (ISEA) indicates that at least two endemic 'super-archaic' species Homo luzonensis and H. floresiensis - were present around the time anatomically modern humans (AMH) arrived in the region >50,000 years ago.”
From Widespread Denisovan ancestry in Island Southeast Asia but no evidence of substantial super-archaic hominin admixture (2021) · cites this paper as [5]
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“If we accept the oldest neighboring dates for modern human occupation on Sunda at 63e73 ka (Westaway et al., 2017) and Sahul for 65 ka (Clarkson et al., 2017), this suggests a colonization period between ca.70e65 ka for Wallacea and Sahul.”
From Least-cost pathway models indicate northern human dispersal from Sunda to Sahul (2018) · cites this paper as Westaway et al., 2017
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Cites
User's Manual for Isoplot 3.00 - A Geochronological Toolkit for Microsoft Excel
Ludwig, K. R. (2003) · Cited by 7,734
Luminescence dating of quartz using an improved single-aliquot regenerative-dose protocol
Murray, A. S., & WINTLE, A. G. (2000) · Radiation Measurements · doi:10.1016/s1350-4487(99)00253-x · Cited by 4,968
Prescott, J. R., & Hutton, J. T. (1994) · Radiation Measurements · doi:10.1016/1350-4487(94)90086-8 · Cited by 3,626
Dose-rate conversion factors: update
Guérin, G., Mercier, N., & Adamiec, G. (2011) · Ancient TL · doi:10.26034/la.atl.2011.443 · Cited by 2,426
Radiocarbon Calibration and Analysis of Stratigraphy: The OxCal Program
Bronk Ramsey, C. (1995) · Radiocarbon · doi:10.1017/s0033822200030903 · Cited by 2,409
Huntley, D. J., Godfrey-Smith, D. I., & Thewalt, M. L. W. (1985) · Nature · doi:10.1038/313105a0 · Cited by 1,379
The half-lives of uranium-234 and thorium-230
Cheng, H., Edwards, R. L., Hoff, J. A., Gallup, C. D., Richards, D. A., & Asmerom, Y. (2000) · Chemical Geology · doi:10.1016/s0009-2541(99)00157-6 · Cited by 1,239
THERMOLUMINESCENCE DATING: BETA‐DOSE ATTENUATION IN QUARTZ GRAINS
Mejdahl, V. (1979) · Archaeometry · doi:10.1111/j.1475-4754.1979.tb00241.x · Cited by 934
Laboratory fading rates of various luminescence signals from feldspar-rich sediment extracts
Thomsen, K. J., Murray, A. S., Jain, M., & Bøtter-Jensen, L. (2008) · Radiation Measurements · doi:10.1016/j.radmeas.2008.06.002 · Cited by 857
A Revised Timescale for Human Evolution Based on Ancient Mitochondrial Genomes
Fu, Q., Mittnik, A., Johnson, P. L. F., Bos, K., Lari, M., Bollongino, R., Sun, C., Giemsch, L., Schmitz, R., Burger, J., et al. (2013) · Current Biology · doi:10.1016/j.cub.2013.02.044 · Cited by 709
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Huntley, D. J., & Baril, M. (1997) · Ancient TL · doi:10.26034/la.atl.1997.271 · Cited by 681
Testing the potential of an elevated temperature IRSL signal from K-feldspar
Buylaert, J., Murray, A. S., Thomsen, K. J., & Jain, M. (2009) · Radiation Measurements · doi:10.1016/j.radmeas.2009.02.007 · Cited by 680
Thiel, C., Buylaert, J., Murray, A. S., Terhorst, B., Hofer, I., Tsukamoto, S., & Frechen, M. (2010) · Quaternary International · doi:10.1016/j.quaint.2010.05.018 · Cited by 650
Archaeology and age of a new hominin from Flores in eastern Indonesia
Morwood, M. J., Soejono, R. P., Roberts, R. G., Sutikna, T., TURNEY, C. S. M., Westaway, K., Rink, W. J., Zhao, J., van den Bergh, G. D., Due, R. A., et al. (2004) · Nature · doi:10.1038/nature02956 · Cited by 597
Self-citationThe earliest unequivocally modern humans in southern China
Liu, W., Martinón‐Torres, M., Cai, Y., Xing, S., Tong, H.-W., Pei, S., Sier, M. J., Wu, X.-H., Edwards, R. L., Cheng, H., et al. (2015) · Nature · doi:10.1038/nature15696 · Cited by 462
Genomic analyses inform on migration events during the peopling of Eurasia
Pagani, L., Lawson, D. J., Jagoda, E., Mörseburg, A., Eriksson, A., Mitt, M., Clemente, F., Hudjashov, G., DeGiorgio, M., Saag, L., et al. (2016) · Nature · doi:10.1038/nature19792 · Cited by 459
Significance of enamel thickness in hominoid evolution
Martin, L. B. (1985) · Nature · doi:10.1038/314260a0 · Cited by 380
Moorrees, C. F. A. (1957) · Harvard University Press eBooks · doi:10.4159/harvard.9780674429499 · Cited by 368
Rethinking the dispersal of Homo sapiens out of Africa
Groucutt, H. S., Petraglia, M. D., Bailey, G. N., Scerri, E. M. L., Parton, A., Clark‐Balzan, L., Jennings, R. P., Lewis, L., Blinkhorn, J., Drake, N., et al. (2015) · Evolutionary Anthropology Issues News and Reviews · doi:10.1002/evan.21455 · Cited by 334
Eggins, S. M., Grün, R., McCulloch, M. T., Pike, A. W. G., Chappell, J., Kinsley, L., Mortimer, G. E., Shelley, M., Murray‐Wallace, C. V., Spötl, C., et al. (2005) · Quaternary Science Reviews · doi:10.1016/j.quascirev.2005.07.006 · Cited by 305
Self-citationThe Rb contents of the K-feldspar grains being measured in optical dating
Huntley, D. J., & Hancock, R. G. V. (2001) · Ancient TL · doi:10.26034/la.atl.2001.333 · Cited by 195
Modern human molar enamel thickness and enamel–dentine junction shape
Smith, T. M., Olejniczak, A. J., Reid, D. J., Ferrell, R. J., & Hublin, J.-J. (2006) · Archives of Oral Biology · doi:10.1016/j.archoralbio.2006.04.012 · Cited by 172
Self-citationWestaway, K., Morwood, M. J., Roberts, R. G., Rokus, A. D., Zhao, J., Storm, P., Aziz, F., van den Bergh, G. D., Sulistyarto, P. H., Jatmiko, J., et al. (2007) · Journal of Human Evolution · doi:10.1016/j.jhevol.2007.06.002 · Cited by 156
Self-citationThe great arc of dispersal of modern humans: Africa to Australia
Oppenheimer, S. (2008) · Quaternary International · doi:10.1016/j.quaint.2008.05.015 · Cited by 146
Stability of IRSL signals from sedimentary K-feldspar samples
Thomsen, K. J., Murray, A. S., & Jain, M. (2011) · Geochronometria · doi:10.2478/s13386-011-0003-z · Cited by 146
The Age of the 20 Meter Solo River Terrace, Java, Indonesia and the Survival of Homo erectus in Asia
Indriati, E., Swisher, C. C., Lepre, C. J., Quinn, R. L., Suriyanto, R. A., Hascaryo, A. T., Grün, R., Feibel, C. S., Pobiner, B. L., Aubert, M., et al. (2011) · PLoS ONE · doi:10.1371/journal.pone.0021562 · Cited by 146
Self-citationHooyer, D. A. (1948) · Data Archiving and Networked Services (DANS) · Cited by 141
The relationships of the later Miocene Hominoidea
Martin, L. B. (1983) · UCL Discovery (University College London) · Cited by 140
Hominin teeth from the early L ate P leistocene site of X ujiayao, N orthern C hina
Xing, S., Martinón‐Torres, M., de Castro, J. M. B., Wu, X., & Liu, W. (2014) · American Journal of Physical Anthropology · doi:10.1002/ajpa.22641 · Cited by 135
Stokes, S., Ingram, S., AITKEN, M. J., Sirocko, F., Anderson, R. F., & Leuschner, D. C. (2003) · Quaternary Science Reviews · doi:10.1016/s0277-3791(02)00243-3 · Cited by 134
The effect of preheating on the IRSL signal from feldspar
Murray, A. S., Buylaert, J., Thomsen, K. J., & Jain, M. (2009) · Radiation Measurements · doi:10.1016/j.radmeas.2009.02.004 · Cited by 133
Louys, J., & Meijaard, E. (2010) · Journal of Biogeography · doi:10.1111/j.1365-2699.2010.02297.x · Cited by 127
Self-citationSkinner, M. M., Gunz, P., Wood, B. A., & Hublin, J. (2008) · Journal of Human Evolution · doi:10.1016/j.jhevol.2008.08.013 · Cited by 127
Self-citationLaser ablation U-series analysis of fossil bones and teeth
Grün, R., Eggins, S. M., Kinsley, L. P. J., Moseley, H., & Sambridge, M. (2014) · Palaeogeography Palaeoclimatology Palaeoecology · doi:10.1016/j.palaeo.2014.07.023 · Cited by 126
Self-citationThe dispersal of Homo sapiens across southern Asia: how early, how often, how complex?
Dennell, R., & Petraglia, M. D. (2012) · Quaternary Science Reviews · doi:10.1016/j.quascirev.2012.05.002 · Cited by 115
U-series and radiocarbon analyses of human and faunal remains from Wajak, Indonesia
Storm, P., Wood, R. E., Stringer, C. B., Bartsiokas, A., de Vos, J., Aubert, M., Kinsley, L., & Grün, R. (2013) · Journal of Human Evolution · doi:10.1016/j.jhevol.2012.11.002 · Cited by 105
Self-citationPetraglia, M. D., Ditchfield, P. W., Jones, S., Korisettar, R., & Pal, J. N. (2011) · Quaternary International · doi:10.1016/j.quaint.2011.07.042 · Cited by 102
Newsome, J. C., & FLENLEY, J. R. (1988) · Journal of Biogeography · doi:10.2307/2845436 · Cited by 100
Grün, R., Huang, P.-H., Huang, W., McDermott, F. P., Thorne, A., Stringer, C. B., & Yan, G. (1998) · Journal of Human Evolution · doi:10.1006/jhev.1997.0211 · Cited by 95
Self-citationClark, T. R., Zhao, J., Roff, G., Feng, Y., Done, T., Nothdurft, L. D., & Pandolfi, J. M. (2014) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2014.04.022 · Cited by 93
Self-citationSkinner, M. M., Gunz, P., Wood, B. A., Boesch, C., & Hublin, J. (2009) · American Journal of Physical Anthropology · doi:10.1002/ajpa.21057 · Cited by 92
Self-citationSpeleothem‐derived Asian summer monsoon variations in Central China, 54–46 ka
Zhou, H., Zhao, J., Wang, Q., Feng, Y., & Tang, J. (2011) · Journal of Quaternary Science · doi:10.1002/jqs.1506 · Cited by 89
Self-citationRoberts, R. G., Westaway, K., Zhao, J., TURNEY, C. S. M., Bird, M. I., Rink, W. J., & Fifield, L. K. (2009) · Journal of Human Evolution · doi:10.1016/j.jhevol.2009.01.003 · Cited by 83
Self-citationErlandson, J. M., & Braje, T. J. (2015) · Quaternary International · doi:10.1016/j.quaint.2015.03.046 · Cited by 83
Murray, A. S., & Mejdahl, V. (1999) · Quaternary Science Reviews · doi:10.1016/s0277-3791(98)00055-9 · Cited by 76
Are published ESR dose assessments on fossil tooth enamel reliable?
Duval, M., & Grün, R. (2015) · Quaternary Geochronology · doi:10.1016/j.quageo.2015.09.007 · Cited by 75
A new U-uptake model for combined ESR/U-series dating of tooth enamel
Shao, Q., Bahain, J., Falguères, C., Dolo, J., & Garcia, T. (2012) · Quaternary Geochronology · doi:10.1016/j.quageo.2012.02.009 · Cited by 75
Pleistocene rainforests: barriers or attractive environments for early human foragers?
Roberts, P., & Petraglia, M. D. (2015) · World Archaeology · doi:10.1080/00438243.2015.1073119 · Cited by 75
A single southern exit of modern humans from Africa: Before or after Toba?
Oppenheimer, S. (2011) · Quaternary International · doi:10.1016/j.quaint.2011.07.049 · Cited by 68
Climate, people and faunal succession on Java, Indonesia: evidence from Song Gupuh
Morwood, M. J., Sutikna, T., Saptomo, E. W., Westaway, K., Jatmiko, J., Due, R. A., Moore, M. W., Umar, D. Y. Y., Sulistyarto, P. H., Zhao, J., et al. (2008) · Journal of Archaeological Science · doi:10.1016/j.jas.2007.11.025 · Cited by 65
Self-citationPreface: research at Liang Bua, Flores, Indonesia
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Self-citationShackelford, L., Demeter, F., Westaway, K., Duringer, P., Ponche, J., Sayavongkhamdy, T., Zhao, J., Barnes, L., Boyon, M., Sichanthongtip, P., et al. (2017) · Quaternary International · doi:10.1016/j.quaint.2016.12.002 · Cited by 56
Self-citationEnamel thickness in Bornean and Sumatran orangutan dentitions
Smith, T. M., Kupczik, K., Machanda, Z. P., Skinner, M. M., & Zermeno, J. P. (2012) · American Journal of Physical Anthropology · doi:10.1002/ajpa.22009 · Cited by 54
Self-citationEffect of the heating rate on the red TL of quartz
Spooner, N. A., & Franklin, A. D. (2002) · Radiation Measurements · doi:10.1016/s1350-4487(01)00109-3 · Cited by 51
Luminescence dating at Katanda — a reassessment
Feathers, J. K., & Migliorini, E. (2001) · Quaternary Science Reviews · doi:10.1016/s0277-3791(00)00041-x · Cited by 47
Environment, preferred habitats and potential refugia for Pleistocene Homo in Southeast Asia
Louys, J., & Turner, A. (2012) · Comptes Rendus Palevol · doi:10.1016/j.crpv.2011.03.003 · Cited by 46
Self-citationWestaway, K., & Roberts, R. G. (2006) · Quaternary Science Reviews · doi:10.1016/j.quascirev.2005.06.010 · Cited by 41
Self-citationDental tissue proportions in fossil orangutans from mainland Asia and Indonesia
Smith, T. M., Bacon, A., Demeter, F., Kullmer, O., Nguyen, K. T., Vos, J. D., Wang, W., Zermeno, J. P., & Zhao, L. (2011) · Human Origins Research · doi:10.4081/hor.2011.3 · Cited by 39
Self-citationJoannes‐Boyau, R. (2013) · Geochronometria · doi:10.2478/s13386-013-0132-7 · Cited by 35
Self-citationIsothermal thermoluminescence signals from quartz
Huot, S., Buylaert, J., & Murray, A. S. (2006) · Radiation Measurements · doi:10.1016/j.radmeas.2006.05.001 · Cited by 33
van der Kaars, S., Williams, M. A. J., Bassinot, F., Guichard, F., Moréno, E., Dewilde, F., & Cook, E. J. (2011) · Quaternary International · doi:10.1016/j.quaint.2011.09.006 · Cited by 29
Early diagenesis of elephant tusk in marine environment
Albéric, M., Gourrier, A., Müller, K., Žižak, I., Wagermaier, W., Fratzl, P., & Reiche, I. (2014) · Palaeogeography Palaeoclimatology Palaeoecology · doi:10.1016/j.palaeo.2014.09.006 · Cited by 22
Pierre, E. S., Westaway, K., Zhao, J., Gagan, M. K., Lentfer, C., Due, R. A., Morwood, M. J., Hantoro, W. S., Djubiantono, T., & Suwargadi, B. W. (2012) · Journal of Archaeological Science · doi:10.1016/j.jas.2012.07.007 · Cited by 7
Self-citationVERTEBRATE RECORDS | Mid-Pleistocene of Southern Asia
de Vos, J. (2007) · Elsevier eBooks · doi:10.1016/b0-44-452747-8/00256-8 · Cited by 5
Middle Archean continent formation by crustal delamination
Zegers, T. E., & van Keken, P. E. (2001) · Geology · doi:10.1130/0091-7613(2001)029
Self-citation
Research works printed but not linked: 5
- Schwartz, J. H., Long, V. T., Cuong, N. L. Kha, L. T. & Tattersall, I. A review of the Pleistocene hominoid fauna of the Socialist Republic of Vietnam (excluding Hylobatidae). Anthropol. Pap. Am. Mus. Nat. Hist. 76, 1–24 (1995)
- Dubois, E. Voorlopig bericht omtrent het onderzoek naar de Pleistocene en Tertiaire vertebraten-fauna van Sumatra en Java, gedurende het jaar 1890. Nat. Tijdschr. Ned. Indië 51, 93–100 (1891)
- de Vos, J. The Pongo faunas from Java and Sumatra and their significance for biostratigraphical and paleo-ecological interpretations. Proc. Koninklijke Nederlandse Akademie Wetenschappen 86, 417–425 (1983)
- Drawhorn, G. M. The Systematics and Paleodemography of Fossil Orangutans. PhD Thesis, Univ. California (Davis, 1994)
- Turner, C. G ., Nichol, C. R . & Scott, G. R. In Advances in Dental Anthropology (eds Kelley, M. A . & Larsen, C. S. ) 13–31 (Wiley-Liss, 1991)
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Metadata
- Authors
- Westaway, K. E., Louys, J., Awe, R. D., Morwood, M. J., Price, G. J., Zhao, J.-X., Aubert, M., Joannes-Boyau, R., Smith, T. M., Skinner, M. M., Compton, T., Bailey, R. M., van den Bergh, G. D., de Vos, J., Pike, A. W. G., Stringer, C., Saptomo, E. W., Rizal, Y., Zaim, J., Santoso, W. D., Trihascaryo, A., Kinsley, L., & Sulistyanto, B.
- Affiliations
- Macquarie University (AU)
- Australian National University (AU)
- Pusat Penelitian Arkeologi Nasional (ID)
- University of Wollongong (AU)
- The University of Queensland (AU)
- Griffith University (AU)
- Southern Cross University (AU)
- University of Kent (GB)
- Natural History Museum (GB)
- University of Oxford (GB)
- University of Southampton (GB)
- Bandung Institute of Technology (ID)
- Corresponding author
- Westaway, K. E.
- ORCID
- Venue
- Nature
- Published
- 2017-08
- Volume
- 548
- Issue
- 7667
- Pages
- 322-325
- ISSN
- 0028-0836 (ISSN-L)
- 1476-4687
- OpenAlex
- W2742580921
- Cited by
- 382
- References
- 67
- Citations by year
- 2026: 18 · 2025: 55 · 2024: 87 · 2023: 45 · 2022: 27 · 2021: 35 · 2020: 33 · 2019: 40 · 2018: 32 · 2017: 10
- FWCI
- 127.04
- Type
- journal article
- Language
- en
- Open access
- green
- kar.kent.ac.uk
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Nature (publishedVersion)
- PubMed (publishedVersion)
- ePrints Soton (University of Southampton) (acceptedVersion)
- Kent Academic Repository (University of Kent) (submittedVersion)
- Digital Commons - University of South Florida (University of South Florida) (submittedVersion)
- Cross Connect (Southern Cross University) (submittedVersion)
- Research Online (University of Wollongong) (submittedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- Max Planck Digital Library (submittedVersion)
- Figshare (submittedVersion)
- ANU Open Research (Australian National University) (submittedVersion)
- MPG.PuRe (Max Planck Society) (submittedVersion)
- Griffith Research Online (submittedVersion)
- Funders
- Leaky Foundation
- Max-Planck-Gesellschaft
- Naturalis Biodiversity Center
- Topics
- Social Sciences › Anthropology › Pleistocene-Era Hominins and Archaeology
- Social Sciences › Anthropology › Pacific and Southeast Asian Studies
- Social Sciences › Arts and Humanities › Archeology (arts and humanities) › Forensic Anthropology and Bioarchaeology Studies
- Keywords
- Sumatra, human, human dispersal, Toba eruption, enamel thickness, luminescence dating, uranium-series dating, electron spin resonance dating, mammalian dentition, speleothems, Pleistocene sea-level lowstand, biostratigraphy
- MeSH terms
- Electron Spin Resonance Spectroscopy, Fossils, Humans, Indonesia, Tooth, Uranium, Luminescence, History, Ancient, Caves, Human Migration, Rainforest
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