Prof Christopher Ramsey: Publications

Pragmatic Bayesians: a Decade of Integrating Radiocarbon Dates into Chronological Models

Chapter in Tools for Constructing Chronologies: Crossing Disciplinary Boundaries, Lecture Notes in Statistics, Springer Verlag (2004) 25-41

Authors:

A Bayliss, Christopher BRONK RAMSEY

Direct Dating of Archaeological Pottery by Compound-Specific 14C Analysis of Preserved Lipids

Analytical Chemistry American Chemical Society (ACS) 75:19 (2003) 5037-5045

Authors:

Andrew W Stott, Robert Berstan, Richard P Evershed, Christopher Bronk-Ramsey, Robert EM Hedges, Martin J Humm

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An early modern human from the Peştera cu Oase, Romania

Proceedings of the National Academy of Sciences Proceedings of the National Academy of Sciences 100:20 (2003) 11231-11236

Authors:

Erik Trinkaus, Oana Moldovan, ştefan Milota, Adrian Bîlgăr, Laurenţiu Sarcina, Sheela Athreya, Shara E Bailey, Ricardo Rodrigo, Gherase Mircea, Thomas Higham, Christopher Bronk Ramsey, Johannes van der Plicht

Abstract:

The 2002 discovery of a robust modern human mandible in the Peştera cu Oase, southwestern Romania, provides evidence of early modern humans in the lower Danubian Corridor. Directly accelerator mass spectrometry radiocarbon ( 14 C)-dated to 34,000–36,000 14 C years B.P., the Oase 1 mandible is the oldest definite early modern human specimen in Europe and provides perspectives on the emergence and evolution of early modern humans in the northwestern Old World. The moderately long Oase 1 mandible exhibits a prominent tuber symphyseos and overall proportions that place it close to earlier Upper Paleolithic European specimens. Its symmetrical mandibular incisure, medially placed condyle, small superior medial pterygoid tubercle, mesial mental foramen, and narrow corpus place it closer to early modern humans among Late Pleistocene humans. However, its cross-sectional symphyseal orientation is intermediate between late archaic and early modern humans, the ramus is exceptionally wide, and the molars become progressively larger distally with exceptionally large third molars. The molar crowns lack derived Neandertal features but are otherwise morphologically undiagnostic. However, it has unilateral mandibular foramen lingular bridging, an apparently derived Neandertal feature. It therefore presents a mosaic of archaic, early modern human and possibly Neandertal morphological features, emphasizing both the complex population dynamics of modern human dispersal into Europe and the subsequent morphological evolution of European early modern humans.

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Rapid Turnover of Hyphae of Mycorrhizal Fungi Determined by AMS Microanalysis of ¹⁴ C

Science American Association for the Advancement of Science (AAAS) 300:5622 (2003) 1138-1140

Authors:

Philip L Staddon, Christopher Bronk Ramsey, Nick Ostle, Philip Ineson, Alastair H Fitter

Abstract:

Processes in the soil remain among the least well-characterized components of the carbon cycle. Arbuscular mycorrhizal (AM) fungi are ubiquitous root symbionts in many terrestrial ecosystems and account for a large fraction of photosynthate in a wide range of ecosystems; they therefore play a key role in the terrestrial carbon cycle. A large part of the fungal mycelium is outside the root (the extraradical mycelium, ERM) and, because of the dispersed growth pattern and the small diameter of the hyphae (<5 micrometers), exceptionally difficult to study quantitatively. Critically, the longevity of these fine hyphae has never been measured, although it is assumed to be short. To quantify carbon turnover in these hyphae, we exposed mycorrhizal plants to fossil (“carbon-14–dead”) carbon dioxide and collected samples of ERM hyphae (up to 116 micrograms) over the following 29 days. Analyses of their carbon-14 content by accelerator mass spectrometry (AMS) showed that most ERM hyphae of AM fungi live, on average, 5 to 6 days. This high turnover rate reveals a large and rapid mycorrhizal pathway of carbon in the soil carbon cycle.

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Bayesian methods applied to the interpretation of multiple OSL dates: high precision sediment ages from Old Scatness Broch excavations, Shetland Isles

Quaternary Science Reviews Elsevier BV 22:10-13 (2003) 1231-1244

Authors:

EJ Rhodes, C Bronk Ramsey, Z Outram, C Batt, L Willis, S Dockrill, J Bond

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Prof Christopher Ramsey

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Pragmatic Bayesians: a Decade of Integrating Radiocarbon Dates into Chronological Models

Authors:

Direct Dating of Archaeological Pottery by Compound-Specific 14C Analysis of Preserved Lipids

Authors:

An early modern human from the Peştera cu Oase, Romania

Authors:

Abstract:

Rapid Turnover of Hyphae of Mycorrhizal Fungi Determined by AMS Microanalysis of ¹⁴ C

Authors:

Abstract:

Bayesian methods applied to the interpretation of multiple OSL dates: high precision sediment ages from Old Scatness Broch excavations, Shetland Isles

Authors:

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Prof Christopher Ramsey

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Pragmatic Bayesians: a Decade of Integrating Radiocarbon Dates into Chronological Models

Authors:

Direct Dating of Archaeological Pottery by Compound-Specific 14C Analysis of Preserved Lipids

Authors:

An early modern human from the Peştera cu Oase, Romania

Authors:

Abstract:

Rapid Turnover of Hyphae of Mycorrhizal Fungi Determined by AMS Microanalysis of 14 C

Authors:

Abstract:

Bayesian methods applied to the interpretation of multiple OSL dates: high precision sediment ages from Old Scatness Broch excavations, Shetland Isles

Authors:

Rapid Turnover of Hyphae of Mycorrhizal Fungi Determined by AMS Microanalysis of ¹⁴ C