Prof Christopher Ramsey: Publications

An Assessment of the Magnitude of the AD1586 Tensho Tsunami Inferred from Lake Suigetsu Sediment Cores

Journal of Geography (Chigaku Zasshi) 122:3 (2013) 493-501

Authors:

Megumi Saito-Kato, Kazuyoshi Yamada, Richard A Staff, Takeshi Nakagawa, Hitoshi Yonenobu, Tsuyoshi Haraguchi, Keiji Takemura, Christopher Bronk RAMSEY

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Birdmen, cemís and duhos: material studies and AMS< sup> 14 C dating of Pre-Hispanic Caribbean wood sculptures in the British Museum

Journal of Archaeological Science 40:12 (2013) 4675-4687

Authors:

J Ostapkowicz, C Bronk Ramsey, F Brock, C Cartwright, R Stacey, M Richards

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Calibration for Archaeological and Environmental Terrestrial Samples in the Time Range 26–50 ka cal BP

Radiocarbon Cambridge University Press (CUP) 55:4 (2013) 2021-2027

Authors:

C Bronk Ramsey, EM Scott, J van der Plicht

Abstract:

For the older part of the radiocarbon dating range, the IntCal13 curve provides the “state of the art” for terrestrial calibration based on all available data. It is constructed from different records, each of which by themselves could be used as a “comparison tool,” depending on the research objectives. This paper discusses the pros and cons of different approaches that can be taken when using 14C dates from this time range where the agreement amongst the underlying data sets is poorer than in other time periods. The discussion is illustrated with example calibrations against IntCa09, IntCal13, and comparisons to the Suigetsu record. The examples and discussion arc aimed at users of terrestrial 14C dates, in particular Upper Paleolithic archaeologists and those working with environmental terrestrial materials in the same time range.

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Comments on the Use of Ezee-Filters™ and Ultrafilters at Orau

Radiocarbon Cambridge University Press (CUP) 55:1 (2013) 211-212

Authors:

Fiona Brock, Tom Higham, Christopher Bronk Ramsey

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Compound-Specific Radiocarbon Dating of Essential and Non-Essential Amino Acids: Towards Determination of Dietary Reservoir Effects in Humans

Radiocarbon Cambridge University Press (CUP) 55:2 (2013) 709-719

Authors:

Shweta Nalawade-Chavan, James McCullagh, Robert Hedges, Clive Bonsall, Adina Boroneanţ, Christopher Bronk Ramsey, Thomas Higham

Abstract:

When humans consume foods from different radiocarbon reservoirs offset in age to the atmosphere, inaccuracies in the 14C date of bone collagen can occur. Mesolithic human skeletons from the Iron Gates section of the Lower Danube Valley have yielded reservoir offsets of up to ∼500 yr. This has been demonstrated through direct dating of bulk collagen from human bones and the remains of ungulate bone projectile points that were found embedded in them (Cook et al. 2001). We present improvements to a novel HPLC method for the detection and separation of underivatized amino acids using a water-only mobile phase free of organic or inorganic modifiers, ensuring very low carbon backgrounds. Our hypothesis is that direct 14C dating of single essential and non-essential amino acids might allow an improvement in the dating accuracy for reservoir-affected human bones. The method facilitates separation of less polar amino acids (mostly “essential”), currently not possible in the recently published protocol. We discuss methodological developments, demonstrate carbon backgrounds, and present analytical approaches to minimize their effects. We validate the precision and accuracy of the method by accelerator mass spectrometry (AMS) dating relatively modern and 14C-dead, known-age bone standards. Finally, we apply the method to the dating of single amino acids from bone samples with a proven ∼500–yr carbon reservoir effect from Mesolithic burials at the Iron Gates sites. We investigate whether differences can be found in AMS dates for essential and non-essential amino acids since, although contemporaneous, these are expected to derive from dietary sources with differing 14C reservoirs.

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Prof Christopher Ramsey

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An Assessment of the Magnitude of the AD1586 Tensho Tsunami Inferred from Lake Suigetsu Sediment Cores

Authors:

Birdmen, cemís and duhos: material studies and AMS< sup> 14 C dating of Pre-Hispanic Caribbean wood sculptures in the British Museum

Authors:

Calibration for Archaeological and Environmental Terrestrial Samples in the Time Range 26–50 ka cal BP

Authors:

Abstract:

Comments on the Use of Ezee-Filters™ and Ultrafilters at Orau

Authors:

Compound-Specific Radiocarbon Dating of Essential and Non-Essential Amino Acids: Towards Determination of Dietary Reservoir Effects in Humans

Authors:

Abstract:

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