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Single-Year German oak and Californian Bristlecone Pine 14C Data at the Beginning of the Hallstatt Plateau from 856 BC to 626 BC

Part of: IntCal 20

Published online by Cambridge University Press:  16 March 2020

Simon M Fahrni*
Department of Earth System Science, University of California, Irvine, CA, USA
John Southon
Department of Earth System Science, University of California, Irvine, CA, USA
Benjamin T Fuller
Department of Earth System Science, University of California, Irvine, CA, USA Department of Archaeology and Heritage Studies, School of Culture and Society, Aarhus University, Moesgård Allé 20, DK-8270, Højbjerg, Denmark
Junghun Park
Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-no. Yuseong-gu, Daejeon34132, Korea
Michael Friedrich
Institute of Botany, University of Hohenheim, Stuttgart, Germany
Raimund Muscheler
Department of Geology, Lund University, Lund, Sweden
Lukas Wacker
Institute of Particle Physics, ETH, Zurich, Switzerland
R E Taylor
Department of Anthropology, University of California, Riverside, CA, USA Cotsen Institute of Archaeology, University of California, Los Angeles, CA, USA
*Corresponding author. Email:


As part of the ongoing effort to improve the Northern Hemisphere radiocarbon (14C) calibration curve, this study investigates the period of 856 BC to 626 BC (2805–2575 yr BP) with a total of 403 single-year 14C measurements. In this age range, IntCal13 was constructed largely from German and Irish oak as well as Californian bristlecone pine 14C dates, with most samples measured with a 10-yr resolution. The new data presented here is the first atmospheric 14C single-year record of the older end of the Hallstatt plateau based on an absolutely dated tree-ring chronology. The data helped reveal a major solar proton event (SPE) which caused a spike in the production rate of cosmogenic radionuclides around 2610/2609 BP. This production event is thought to have reached a magnitude similar to the 774/775 AD production event but has remained undetected due to averaging effects in the decadal calibration data. The record leading up to the 2610/2609 BP event reveals a 11-yr solar cycle with varying cyclicity. Features of the new data and the benefits of higher resolution calibration are discussed.

Conference Paper
© 2020 by the Arizona Board of Regents on behalf of the University of Arizona

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