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    Evidence for the early onset of the Ipswichian thermal optimum: palaeoecology of last interglacial deposits at Whittlesey, eastern England

    Langford, Harold and Boreham, S. and Briant, Rebecca M and Coope, G.R. and Horne, D. and Penkman, K.E.H and Schreve, D. and Whitehouse, N. and Whittaker, J. (2017) Evidence for the early onset of the Ipswichian thermal optimum: palaeoecology of last interglacial deposits at Whittlesey, eastern England. Journal of the Geological Society 174 (6), pp. 988-1003. ISSN 0016-7649.

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    Abstract

    Fossiliferous deposits infilling a channel at Whittlesey, eastern England, are dated by amino acid racemization to the Last Interglacial, and pollen analysis indicates deposition in Ipswichian biozones Ip Ib and Ip IIb. Multidisciplinary palaeoenvironmental analyses of these deposits provide a rare insight into Ip Ib subzone conditions. Specifically, the Ip Ib deposits contain exotic thermophiles Naias minor, Belgrandia marginata, Bembidion elongatum, Pelochares versicolor, Caccobius schreberi, Onthophagus massai and Emys orbicularis, usually associated with Ip IIb. Combined palaeotemperature reconstructions based on beetle, ostracod and vertebrate assemblages of the Ip Ib deposits indicate that summers (mean July range +19 to +22°C) were at least 2°C warmer than at present, while winters (mean January air temperature range 0 to +7°C) were probably similar to those of today. These palaeotemperature ranges encompass those for Ip IIb deposits at Trafalgar Square (+20 to +21°C and +1.5 to +3°C), previously considered the only Ipswichian site to record temperatures significantly warmer than Holocene temperatures. Of particular significance is that thermal optimal conditions commenced in Ip Ib, rather than being confined to Ip IIb. This demonstrates rapid warming and biological response to early Ipswichian climate amelioration, which accords with the deep-sea Last Interglacial and European Eemian records.

    Metadata

    Item Type: Article
    School: Birkbeck Schools and Departments > School of Social Sciences, History and Philosophy > Department of Geography
    Depositing User: Rebecca Briant
    Date Deposited: 16 Jun 2017 08:38
    Last Modified: 16 Sep 2018 00:10
    URI: http://eprints.bbk.ac.uk/id/eprint/18953

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