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Dating of Prehistoric Burial Mounds by 14C Analysis of Soil Organic Matter Fractions

Published online by Cambridge University Press:  18 July 2016

Søren M Kristiansen ,
Kristian Dalsgaard ,
Mads K Holst ,
Bent Aaby  and
Jan Heinemeier
Søren M Kristiansen*
Affiliation:
Department of Agroecology, Danish Institute of Agricultural Sciences, P.O. Box 50, DK-8830 Tjele, Denmark.
Kristian Dalsgaard
Affiliation:
Department of Earth Sciences, University of Aarhus, Ny Munkegade Building 520, DK-8000 Aarhus C, Denmark.
Mads K Holst
Affiliation:
Department of Prehistoric Archaeology, University of Aarhus, Moesgård, DK-8270 Højbjerg, Denmark.
Bent Aaby
Affiliation:
National Museum Environmental Archaeology, National Museum of Denmark, Ny Vestergade 11, DK-1471 Copenhagen K, Denmark.
Jan Heinemeier
Affiliation:
The AMS 14C Dating Laboratory, Institute of Physics and Astronomy, University of Aarhus, Ny Munkegade Building 520, DK-8000 Aarhus C, Denmark.
*
Corresponding author. Email: [email protected].
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Abstract

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Dating of prehistoric anthropogenic earthworks requires either excavation for archaeological artifacts or macroscopic organic matter suitable for 14C analysis. Yet, the former, in many cases, is undesirable and the latter is difficult to obtain. Here we present a soil science procedure, which has the potential to overcome these problems. It includes careful sampling of buried former soil surfaces, acid-alkali-acid fractionation of soil organic matter (SOM), and subsequent 14C AMS dating. To test the procedure, soil from one of the largest known burial mounds in Scandinavia, Hohøj, and 9 other Danish burial mounds were sampled. The 14C dates from extracted SOM fractions were compared to reference ages obtained by other methods. We show that humic acid fractions in 7 of the 10 mounds had the same age as the reference, or were, at maximum, 280 yr older than the reference ages. The best age estimates were derived from an organic-rich layer from the upper cm of buried soil or sod. Differences among SOM fraction ages probably indicate the reliability of the dating. Hohøj dated to approximately 1400 BC and, thus, was up to 500 yr older than other dated Scandinavian mounds of comparable size. The remaining investigated burial mounds were dated to between 1700 and 1250 BC. We conclude that combined sampling of buried soil surfaces, SOM fractionation, and 14C analysis allows for dating of archaeological earthworks when minimal disturbance is required, or if no macroscopic organic remains are found.

Type
Soils and Sediments
Information
Radiocarbon , Volume 45 , Issue 1 , 2003 , pp. 101 - 112
Copyright
Copyright © The Arizona Board of Regents on behalf of the University of Arizona 

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