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Stable isotopes confirm the Banwell Bone Cave Mammal Assemblage Zone represents an MIS 5 fauna

Published online by Cambridge University Press:  20 January 2021

Rhiannon E. Stevens Open the ORCID record for Rhiannon E. Stevens [Opens in a new window]  and
Hazel Reade
Rhiannon E. Stevens*
Affiliation:
Institute of Archaeology, University College London, 31-34 Gordon Square, London, WC1H 0PY, United Kingdom
Hazel Reade
Affiliation:
Institute of Archaeology, University College London, 31-34 Gordon Square, London, WC1H 0PY, United Kingdom
*
*Corresponding author at: Institute of Archaeology, University College London, 31-34 Gordon Square, London, WC1H 0PY, United Kingdom. E-mail address: rhiannon.stevens@ucl.ac.uk (R.E. Stevens).
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Abstract

The position of the Banwell Bone Cave mammal assemblage zone (MAZ) in the mammalian biostratigraphy of the British Isles has been the focus of debate for decades. Dominated by fauna typical of cold environments it was originally linked to the marine oxygen isotope stage (MIS) 4 stadial (ca. 72–59 ka). Subsequently it was argued that the Banwell Bone Cave MAZ more likely relates to the temperate interstadial of MIS 5a (ca. 86–72 ka). It is envisioned that “cold fauna” such as bison and reindeer moved into Britain during stadial MIS 5b (ca. 90 ka) and were subsequently isolated by the rising sea level during MIS 5a. Here we investigate environmental conditions during the Banwell Bone Cave MAZ using bone collagen δ13C and δ15N and tooth enamel δ18O and δ13C isotope analysis. We analyse bison and reindeer from the MAZ type-site, Banwell Bone Cave. Our results show unusually high δ15N values, which we ascribe to arid conditions within a temperate environment. Palaeotemperature estimates derived from enamel δ18O indicate warm temperatures, similar to present day. These results confirm that the Banwell Bone Cave MAZ relates to a temperate interstadial and supports its correlation to MIS 5a rather than MIS 4.

Keywords

MIS 5aStable isotopeCarbonNitrogenOxygenCollagenEnamelReindeerBisonBritish IslesStage 5
Type
Research Article
Information
Quaternary Research , Volume 101 , May 2021 , pp. 245 - 255
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Copyright © University of Washington. Published by Cambridge University Press, 2021

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