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Enhancing Radiocarbon Chronologies of Colonization: Chronometric Hygiene Revisited

Published online by Cambridge University Press:  18 January 2019

Magdalena M E Schmid Open the ORCID record for Magdalena M E Schmid [Opens in a new window] ,
Rachel Wood ,
Anthony J Newton ,
Orri Vésteinsson  and
Andrew J Dugmore
Magdalena M E Schmid*
Affiliation:
School of GeoSciences, University of Edinburgh, EH8 9XPEdinburgh, UK Department of Archaeology, University of Iceland, Sæmundargata 2, Reykjavík 101, Iceland Centre for Archaeological Sciences, School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW2522, Australia Australian Research Council (ARC) Centre of Excellence for Australian Biodiversity and Heritage, University of Wollongong, Wollongong, NSW2522, Australia
Rachel Wood
Affiliation:
Research School of Earth Sciences, Australia National University, Canberra, 0200 ACT, Australia
Anthony J Newton
Affiliation:
School of GeoSciences, University of Edinburgh, EH8 9XPEdinburgh, UK
Orri Vésteinsson
Affiliation:
Department of Archaeology, University of Iceland, Sæmundargata 2, Reykjavík 101, Iceland
Andrew J Dugmore
Affiliation:
School of GeoSciences, University of Edinburgh, EH8 9XPEdinburgh, UK Department of Anthropology, Washington State University, Pullman, WA99164-0001, USA The Graduate Center, City University of New York, 365 Fifth Avenue, New York, NY10016-4309, USA
*
*Corresponding author. Email: [email protected].
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Abstract

Accurately dating when people first colonized new areas is vital for understanding the pace of past cultural and environmental changes, including questions of mobility, human impacts and human responses to climate change. Establishing effective chronologies of these events requires the synthesis of multiple radiocarbon (14C) dates. Various “chronometric hygiene” protocols have been used to refine 14C dating of island colonization, but they can discard up to 95% of available 14C dates leaving very small datasets for further analysis. Despite their foundation in sound theory, without independent tests we cannot know if these protocols are apt, too strict or too lax. In Iceland, an ice core-dated tephrochronology of the archaeology of first settlement enables us to evaluate the accuracy of 14C chronologies. This approach demonstrated that the inclusion of a wider range of 14C samples in Bayesian models improves the precision, but does not affect the model outcome. Therefore, based on our assessments, we advocate a new protocol that works with a much wider range of samples and where outlying 14C dates are systematically disqualified using Bayesian Outlier Models. We show that this approach can produce robust termini ante quos for colonization events and may be usefully applied elsewhere.

Keywords

Bayesian Outlier ModelsEast PolynesiaIcelandmarine/freshwater reservoir effectwood charcoal with inbuilt age
Type
Research Article
Information
Radiocarbon , Volume 61 , Issue 2 , April 2019 , pp. 629 - 647
Copyright
© 2019 by the Arizona Board of Regents on behalf of the University of Arizona 

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References

REFERENCES

Anderson, A. 1991. The chronology of colonization in New Zealand. Antiquity 65:767–795.Google Scholar
Arneborg, J, Heinemeier, J, Lynnerup, N, Nielsen, HL, Rud, N, Sveinbjornsdottir, AE. 1999. Change of diet of the Greenland Vikings determined from stable carbon isotope analysis and 14C dating of their bones. Radiocarbon 41:157–168.Google Scholar
Ascough, PL, Cook, GT, Church, MJ, Dugmore, AJ, Arge, SV, McGovern, TH. 2006. Variability in North Atlantic marine radiocarbon reservoir effects at c.1000 AD. The Holocene 16(1):131–136.Google Scholar
Ascough, PL, Cook, GT, Church, MJ, Dugmore, AJ, McGovern, TH, Dunbar, E, Einarsson, Á, Friðriksson, A, Gestsdóttir, H. 2007. Reservoirs and radiocarbon: 14C dating problems in Myvatnssveit, Northern Iceland. Radiocarbon 49(2):947–961.Google Scholar
Ascough, PL, Cook, GT, Church, MJ, Dunbar, E, Einarsson, Á, McGovern, TH, Dugmore, AJ, Perdikaris, S, Hastie, H, Friðriksson, A, Gestsdóttir, H. 2010. Temporal and spatial variations in freshwater 14C reservoir effects: Lake Myvatn, Northern Iceland. Radiocarbon 52(3):1098–1112.Google Scholar
Ascough, PL, Cook, GT, Hastie, H, Dunbar, E, Church, MJ, Einarsson, Á, McGovern, TH, Dugmore, AJ. 2011. An Icelandic freshwater radiocarbon reservoir effect: Implications for lacustrine 14C chronologies. The Holocene 21(7):1073–1080.Google Scholar
Ascough, PL, Church, MJ, Cook, GT, Dunbar, E, Gestsdóttir, H, McGovern, TH, Dugmore, AJ, Friðriksson, A, Edwards, KJ. 2012. Radiocarbon reservoir effects in human bone collagen from northern Iceland. Journal of Archaeological Science 39(7):2261–2271.Google Scholar
Barnett, V, Lewis, T. 1978. Outliers in statistical data. John Wiley & Sons.Google Scholar
Batt, CM, Schmid, MME, Vésteinsson, O. 2015. Constructing chronologies in Viking Age Iceland: Increasing dating resolution using Bayesian approaches. Journal of Archaeological Science 62:161–174.Google Scholar
Bayliss, A. 2015. Quality in Bayesian chronological models in archaeology. World Archaeology 47(4):677–700.Google Scholar
Bayliss, A, Bronk Ramsey, C. 2004. Pragmatic Bayesians: a decade of integrating radiocarbon dates into chronological models. In: Buck CE, Millard AR, editors. Tools for constructing chronologies: crossing disciplinary boundaries. Lecture Notes in Statistics 177. London: Springer. p. 25–41.Google Scholar
Bronk Ramsey, C. 2009a. Dealing with outliers and offsets in radiocarbon dating. Radiocarbon 51(3):1023–1045.Google Scholar
Bronk Ramsey, C. 2009b. Bayesian analysis of radiocarbon dates. Radiocarbon 51(1):337–360.Google Scholar
Bronk Ramsey C, Dee MW, Rowland JM, Higham TF, Harris SA, Brock F, Quiles A, Wild EM, Marcus ES, Shortland AJ. 2010. Radiocarbon-based chronology for dynastic Egypt. Science 328(5985):1554–1557.Google Scholar
Bronk Ramsey, C. 2017. OxCal 4.3 manual. Available at http://c14.arch.ox.ac.uk/oxcalhelp/hlp_contents.html.Google Scholar
Christen, JA, Pérez, S. 2009. New robust statistical models for radiocarbon data. Radiocarbon 51(3):1047–1059.Google Scholar
Dee, M, Bronk Ramsey, C. 2014. High-precision Bayesian modeling of samples susceptible to inbuilt age. Radiocarbon 56(1):83–89.Google Scholar
Dye, TS. 2015. Dating human dispersal in Remote Oceania: a Bayesian view from Hawai’i. World Archaeology 47(4):661–676.Google Scholar
Grönvold, K, Óskarsson, K, Johnsen, SJ, Clausen, HB, Hammer, CU, Bond, G, Bard, E. 1995. Ash layers from Iceland in the Greenland GRIP ice core correlated with oceanic and land sediments. Earth and Planetary Science Letters 135:149–155.Google Scholar
Hafliðason, H, Larsen, G, Ólafsson, G. 1992. The recent sedimentation history of Þingvallavatn, Iceland. Oikos 64:80–95.Google Scholar
Haflidason, H, Eiriksson, J, Kreveld, SV. 2000. The tephrochronology of Iceland and the North Atlantic region during the Middle and Late Quaternary: a review. Journal of Quaternary Science 15(1):3–22.Google Scholar
Hicks, M, Friðriksson, A, Snæsdóttir, M, et al. 2013. Excavations at Skútustaðir, N. Iceland 2013 preliminary report. FSI Report No. FS5 44–8275.Google Scholar
Hogg, AG, Higham, TFG, Lowe, DJ, Palmer, JG, Reimer, PJ, Newnham, RM. 2003. A wiggle-match date for Polynesian settlement of New Zealand. Antiquity 77(295):116–125.Google Scholar
Johannesson, H, Einarsson, S. 1988. Krýsuvíkureldar I. Aldur Ögmundarhrauns og Miðaldalagsins. Jökull 38:71–85.Google Scholar
Lucas, G. 2009. Hofstaðir. Excavations of a Viking Age Feasting Hall in Northeastern Iceland. Fornleifastofnun Íslands, Reykjavík.Google Scholar
Millard, AR. 2014. Conventions for reporting radiocarbon determinations. Radiocarbon 56: 555–559.Google Scholar
Nordahl, E. 1988. Reykjavík from the archaeological point of view. Uppsala: Societas Archaeologica Upsaliensis.Google Scholar
Petchey, F, Anderson, A, Zondervatn, A, Ulm, S, Hogg, A. 2008. New marine ΔR values for the South pacific subtropical gyre region. Radiocarbon 50(3):373–397.Google Scholar
Petchey, F. 2013. High-resolution radiocarbon dating of marine materials in archaeological contexts: radiocarbon marine reservoir variability between Anadara, Gafrarium, Batissa, Polymesoda spp. and Echinoidea at Caution Bay, southern coastal Papua New Guinea. Archaeological and Anthropological Sciences 5:69–80.Google Scholar
Pettitt, PB, Davies, W, Gamble, CS, Richards, MB. 2003. Paleolithic radiocarbon chronology: quantifying our confidence beyond two half-lives. Journal of Archaeological Sciences 30:1685–1693.Google Scholar
Reimer PJ, Bard E, Bayliss A, Beck JW, Blackwell PG, Bronk Ramsey C, Buck C, Cheng H, Edwards RL, Friedrich M, Grootes PM, Guilderson TP, Haflidason H, Hajdas I, Hatté C, Heaton TJ, Hoffmann DL, Hogg AG, Hughen KA, Kaiser KF, Kromer B, Manning SW, Niu M, Reimer RW, Richards DA, Scott EM, Southon JR, Staff RA, Turney CSM, van der Plicht J. 2013. IntCal13 and Marine13 radiocarbon age calibration curves 0–50,000 years cal BP. Radiocarbon 55(4):1869–1887.Google Scholar
Rieth, TM, Hunt, TL, Lipo, C, Wilmshurst, JM. 2011. The 13th century Polynesian colonization of Hawai’i Island. Journal of Archaeological Sciences 38(10):2740–2749.Google Scholar
Roberts, HM, Snæsdóttir, M, Mehler, N, Vésteinsson, O. 2003. Skáli frá Víkingsöld í Reykjavík. Árbók hins íslenska fornleifafélags 2001–2002:219–234.Google Scholar
Rodríguez-Reya M, Herrando-Perez S, Gillespie R, Jacobs Z, Saltréa F, Brook BW, Prideaux GJ, Roberts RG, Cooper A, Alroy J, Miller GH, Bird MI, Johnson CN, Beeton N, Turney CSM, Bradshaw CJA. 2015. Criteria for assessing the quality of Middle Pleistocene to Holocene vertebrate fossil ages. Quaternary Geochronology 30:69–79.Google Scholar
Rull, V. 2016. The EIRA Database: Glacial to Holocene radiocarbon ages from Easter Island’s sedimentary records. Frontiers in Ecoloy and Evolution 4(44):1–6.Google Scholar
Russell, N, Cook, G, Ascough, P, Dugmore, A. 2010. Spatial variation in the marine radiocarbon reservoir effect throughout the Scottish post-Roman to Late Medieval period: North Sea values (500–1350 BP). Radiocarbon 52(10):1166–1181.Google Scholar
Sayle, KL, Hamilton, WD, Cook, GT, Ascough, PL, Gestsdóttir, H, McGovern, TH. 2016. Deciphering diet and monitoring movement: multiple stable isotope analysis of the Viking Age settlement at Hofstaðir, Lake Mývatn, Iceland. American Journal of Physical Anthropology 160(1):126–136.Google Scholar
Schmid, MME, Dugmore, AJ, Newton, AJ, Vésteinsson, O. 2017a. Tephra isochrons and chronologies of colonisation. Quaternary Geochronology 40:56–66.Google Scholar
Schmid, MME, Zori, D, Erlendsson, E, Batt, C, Damiata, BN, Byock, J. 2017b. A Bayesian approach to linking archaeological, paleoenvironmental and documentary datasets relating to the settlement of Iceland (Landnám). The Holocene 28(1):19–33.Google Scholar
Schmid, MME, Dugmore, AJ, Foresta, L, Newton, AJ, Vésteinsson, O, Wood, R. 2018. How 14C dates on wood charcoal increase precision when dating colonization: The examples of Iceland and Polynesia. Quaternary Geochronology 48:64–71. https://doi.org/10.1016/j.quageo.2018.07.015.Google Scholar
Sigl, M, Winstrup, M, McConnell, JR, Welten, KC, Plunkett, G, Ludlow, F, Büntgen, U, Caffee, M, Chellman, N, Dahl-Jensen, D, et al. 2015. Timing and climate forcing of volcanic eruptions for the past 2,500 years. Nature 523:543–562.Google Scholar
Sigurgeirsson, MÁ. 2010. Archaeological research in Skagafjörður, summer 2009. Tephra layers. Unpublished excavation Report 2010/01:7.Google Scholar
Sigurgeirsson, MÁ, Hauptfleisch, U, Newton, A, Einarsson, Á. 2013. Dating of the Viking Age landnám tephra sequence in Lake Mývatn sediment, North Iceland. Journal of the North Atlantic 21:1–11.Google Scholar
Spriggs, M 1989. The dating of the Island Southeast Asian Neolithic: an attempt at chronometric hygiene and linguistic correlation. Antiquity 63(240):587–613.Google Scholar
Spriggs, M, Anderson, A. 1993. Late colonization of East Polynesia. Antiquity 67:200–217.Google Scholar
Stuiver, M, Pearson, G, Braziunas, T. 1986. Radiocarbon age calibration of marine samples back to 9000 cal yr BP. Radiocarbon 28(2B):980–1021.Google Scholar
Sveinbjörnsdóttir, AE, Heinemeier, J, Guðmundsson, G. 2004. 14C dating of the settlement of Iceland. Radiocarbon 46:387–394.Google Scholar
Sveinbjörnsdóttir, AE et al. 2010. Dietary reconstruction and reservoir correction of 14C dates on bones from pagan and early Christian graves in Iceland. Radiocarbon 52:682–696.Google Scholar
Waterbolk, HT. 1971. Working with radiocarbon dates. Prehistory Society Proceedings 37(2):15–33.Google Scholar
Vésteinsson, O. 2010. Ethnicity and class in settlement period Iceland. In: Sheehan J, Ó Corráin D, editors. The Viking Age: Ireland and the West. Papers from the Proceedings of the Fifteenth Viking Congress, Cork, 18–27 August 2005. Dublin: Four Courts Press.Google Scholar
Vésteinsson, O, McGovern, T. 2012. The peopling of Iceland. Norwegian Archaeological Review 45(2):206–218.Google Scholar
Williams, A. 2012. The use of summed radiocarbon probability distributions in archaeology: a review of methods. Journal of Archaeological Science 39(3):578–589.Google Scholar
Wilmshurst, JM, Hunt, TL, Lipo, CP, Anderson, AJ. 2011. High-precision radiocarbon dating shows recent and rapid initial human colonization of East Polynesia. Proceedings of the National Academy of Sciences 108(5):1815–1820.Google Scholar
Wood, R. 2015. From revolution to convention: The past, present and future of radiocarbon dating. Journal of Archaeological Science 56:61–72.Google Scholar
Zielinski, GA, Germani, MS, Larsen, G, Baille, MGL, Whitlow, S, Twickler, MS, Taylor, KC. 1997. Volcanic aerosol records and tephrochronology of the Summit, Greenland, ice cores. Journal of Geophysical Research 102 C12:26625–26640.Google Scholar
Þórarinsson, S. 1958. The Öræfajökull eruption of 1362. Acta Naturalia Islandica 2:1–99.Google Scholar
Þórarinsson, S. 1967. The eruptions of Hekla in historical times. In: The Eruption of Hekla 1947–1948, Vol. I. Societas Scientiarum Islandica, Reykjavík. p. 1–183.Google Scholar
Þórarinsson, S. 1974. Vötnin stríð . Bókaútgáfa Menningarsjóðs. Reykjavík.Google Scholar
Þórarinsson, S. 1975. Katla and the annals of Katla tephras (in Icelandic). Árbók Íslands 1975:125–149.Google Scholar
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