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The Settlement Date of Iceland Revisited: Evaluation of 14C Dates from Sites of Early Settlers in Iceland by Bayesian Statistics

Published online by Cambridge University Press:  10 February 2016

Árný E Sveinbjörnsdóttir ,
Christopher Bronk Ramsey  and
Jan Heinemeier
Árný E Sveinbjörnsdóttir*
Affiliation:
Institute of Earth Sciences, University of Iceland, Sturlugata 7, IS 101Iceland.
Christopher Bronk Ramsey
Affiliation:
Oxford Radiocarbon Accelerator Unit, South Parks Road, University of Oxford, Oxford OX1 3QY, UK.
Jan Heinemeier
Affiliation:
AMS 14C Dating Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark.
*
*Corresponding author. Email: arny@hi.is
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Abstract

The settlement time of Iceland has been debated for years as radiocarbon dates of bulk wood samples have been interpreted to set a timing 150–200 yr earlier than indicated by tephrochronology (later than AD 871±2) and the Sagas (AD 874). This early date is also in conflict with the dating results on extensive series of short-lived material such as grain and domestic animal and human bone remains of early settlers. The old-wood effect for the charcoal and bulk wood samples has been suggested to explain this controversy. This study uses a Bayesian model, implemented in the OxCal program, to show that the charcoal data combined with short-lived material (grain/bone) suggest ages anywhere in the interval AD 854–922 (95.4% probability), indicating that the available 14C data cannot be taken as compelling evidence that there was a settlement any earlier than AD 922. The Bayesian model shows that the observed exponential distribution of the excess age of the bulk wood samples is exactly as expected if there was an old-wood effect evident in the samples.

Keywords

inbuilt ageIceland settlementBayesian modeling
Type
Research Article
Information
Radiocarbon , Volume 58 , Supplement 2 , June 2016 , pp. 235 - 245
Copyright
© 2016 by the Arizona Board of Regents on behalf of the University of Arizona 

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References

REFERENCES

Allen, MS, Huebert, JM. 2014. Short-lived plant materials, long-lived trees, and Polynesian 14C dating: considerations for 14C sample selection and documentation. Radiocarbon 56(1):257–276.CrossRefGoogle Scholar
Arneborg, J, Heinemeier, J, Lynnerup, N, Nielsen, HL, Rud, N, Sveinbjörnsdóttir, ÁE. 1999. Change of diet of the Greenland Vikings determined from stable carbon isotope analysis and 14C dating of their bones. Radiocarbon 41(2):157–168.CrossRefGoogle Scholar
Arnold, JR, Libby, WF. 1949. Age determinations by radiocarbon content: checks with samples of known age. Science 110(2869):678–680.CrossRefGoogle ScholarPubMed
Ascough, PL, Cook, GT, Church, MJ, Dugmore, AJ, McGovern, TH, Dunbar, E, Einarsson, Á, Fridriksson, A, Gestsdóttir, H. 2007. Reservoirs and radiocarbon: 14C dating problems in Mývatnssveit, northern Iceland. Radiocarbon 49(2):947–961.CrossRefGoogle Scholar
Ascough, PL, Cook, GT, Church, MJ, Dunbar, E, Einarsson, Á, McGovern, TH, Dugmore, AJ, Perdikaris, S, Hastie, H, Fridriksson, A, Gestsdóttir, H. 2010. Temporal and spatial variations in freshwater 14C reservoir effects: Lake Mývatn, northern Iceland. Radiocarbon 52(3):1098–1112.CrossRefGoogle 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. Holocene 21(7):1073–1080.CrossRefGoogle Scholar
Ascough, PL, Church, MJ, Cook, GT, Dunbar, E, Gestsdóttir, H, McGovern, TH, Dugmore, AJ, Fridriksson, A, Edwards, KJ. 2012. Radiocarbon reservoir effects in human bone collagen from northern Iceland. Journal of Archaeological Science 39(7):2261–2271.CrossRefGoogle Scholar
Belfast online Marine Reservoir Correction Database. 2015. http://calib.qub.ac.uk/marine. Accessed 17 December 2015.Google Scholar
Bronk Ramsey, C. 1995. Radiocarbon calibration and analysis of stratigraphy: the OxCal program. Radiocarbon 37(2):425–430.CrossRefGoogle Scholar
Bronk Ramsey, C. 2009. Dealing with outliers and offsets in radiocarbon dating. Radiocarbon 51(3):1023–1045.CrossRefGoogle Scholar
Dee, M, Bronk Ramsey, C. 2014. High-precision Bayesian modeling of samples susceptible to inbuilt age. Radiocarbon 56(1):83–94.CrossRefGoogle Scholar
Eggertsson, Ó. 2006. Fornskógar. In: Halldórsson G, editor. Skógarbók Grænni skóga. Akureyri: The Agricultural University of Iceland. p 23–28. In Icelandic.Google Scholar
Erlendsson, E, Edwards, KJ. 2010. Gróðurfarsbreytingar á Íslandi við landnám. Árbók hins íslenska fornleifafélags. p 29–55. In Icelandic with English summary.Google Scholar
Govaerts, R, Frodin, DG. 1998. World Checklist and Bibliography of Fagales (Betulaceae, Corylaceae, Fagaceae and Ticodendraceae). London: The Royal Botanical Gardens, Kew.Google Scholar
Grímsson, Th, Einarsson, Th. 1979. Fornminjar í Reykjavík og aldursgreiningar. Árbók hins íslenska Fornleifafélag 1969:80–97.Google Scholar
Grönvold, K, Oskarsson, N, 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(1–4):149–155.CrossRefGoogle Scholar
Hall, VA, Pilcher, JR, McCormac, FG. 1993. Tephra-dated lowland landscape history of the north of Ireland, A.D. 750–1150. New Phytologist 125(1):193–202.CrossRefGoogle Scholar
Hallsdóttir, M. 1987. Pollen analytical studies of human influence on vegetation in relation to the landnám tephra layer in southwest Iceland [PhD dissertation]. Lund: Lund University.Google Scholar
Hallsdóttir, M. 1996. Frjógreining. Frjókorn sem heimild um landnámid. In: Grímsdóttir GÁ, editor. Um Landnám á Íslandi. Reykjavík: Vísindafélag Íslendinga. p 123–134.Google Scholar
Hermanns-Audardóttir, M. 1989. Islands tidiga bosättning. Studiea Archaeologica Universitatis Umensis, 1. Umeå 184 p.Google Scholar
Jónsson, Th. 2004. Stature of sub-arctic birch in relation to growth rate, lifespan and tree form. Annals of Botany 94:753–762.CrossRefGoogle ScholarPubMed
Kuivinen, L, Lawson, MP. 1982. Dendroclimatic analysis of birch in south Greenland. Arctic and Alpine Research 14:243–250.CrossRefGoogle Scholar
Larsen, G. 1996. Gjóskulagatímatal og gjóskulög frá tíma norræns landnáms á Íslandi. In: Grímsdóttir GÁ, editor. Um Landnám á Íslandi. Reykjavík: Vísindafélag Íslendinga. p 81–106.Google Scholar
Nordahl, E. 1988. Reykjavík from the Archaeological Point of View, Aun 12. Uppsala: Societatas Archaeologica Upsalensis. 150 p.Google Scholar
Olafsson, G. 1998. Fylgsnið í hellinum Víðgelmi. Árbók hins íslenska fornleifafélags. p 125–142. In Icelandic with English summary.Google Scholar
Reimer, PJ, Bard, E, Bayliss, A, Beck, JW, Blackwell, PG, Bronk Ramsey, C, Buck, CE, 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.CrossRefGoogle Scholar
Sveinbjörnsdóttir, AE, Heinemeier, J, Gudmundsson, G. 2004. 14C datings and the settlement of Iceland. Radiocarbon 46(1):387–394.CrossRefGoogle Scholar
Sveinbjörnsdóttir, ÁE, Heinemeier, J, Arneborg, J, Lynnerup, N, Ólafsson, G, Zoëga, G. 2010. Dietary reconstruction and reservoir correction of 14C dates on bones from pagan and early Christian graves from Iceland. Radiocarbon 52(2–3):682–696.CrossRefGoogle Scholar
Theodórsson, P. 1993. Geislakolsgreining gjóskulaga og aldur landnámslagsins. Náttúrufrædingurinn 63:275–283. In Icelandic with English summary.Google Scholar
Theodórsson, P. 1997. Upphaf landnáms og geislakolsgreiningar. Skírnir 171:92–110. In Icelandic with English summary.Google Scholar
Theodórsson, P. 1998. Norse settlement of Iceland – close to AD 700? Norwegian Archaeological Review 31:29–38.CrossRefGoogle Scholar
Theodórsson, P. 2009. Upphaf landnáms á Íslandi 670 AD. Skírnir 183:261–280. In Icelandic with English summary.Google Scholar
Theodórsson, P. 2010. Hvað hét fyrsti landnámsmaðurinn? Skírnir 184:511–521. In Icelandic with English summary.Google Scholar
Theodórsson, P. 2011. Upphaf landnáms á Íslandi. Raunvísindastofnun Háskólans. RH-16-2011. 25 p. In Icelandic.Google Scholar
Theodórsson, P. 2012. Kolefni-14 aldursgreiningar í íslenskri fornleifafræði. Raunvísindastofnun Háskólans. RH-02-2012. 46 p. In Icelandic.Google Scholar
Vilhjálmsson, VÖ. 1991. Radiocarbon dating and Icelandic archaeology. Laborativ Arkeologi 5:101–114.Google Scholar
Zielinski, GA, Germani, MS, Larsen, G, Baille, MGL, Whitlow, S, Twickier, MS, Taylor, KC. 1997. Volcanic aerosol records and tephrochronology of the Summit, Greenland ice cores. Journal of Geophysical Research 102(C12):26,625–26,640.CrossRefGoogle Scholar
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