Holocene relative sea level change in the Outer Hebrides, Scotland, UK

Jason T. Jordan, D. Smith, S. Dawson, A. Dawson

    Research output: Contribution to conferenceAbstract

    Abstract

    Evidence for relative sea level changes during the middle and late Holocene is examined from two locations on the Atlantic coast of Harris, Outer Hebrides, Scotland, using morphological mapping and survey, stratigraphical, grain size and diatom analysis, and radiocarbon dating. The objective was to determine whether this location, peripheral to a glacio-isostatic uplift centre, would register fluctuations in the nearshore sea surface and whether local variations in ice loading might be detected in the altitudes of sea level index points. The earliest event identified is a marine flood, which occurred after 7982-8348
    calibrated years (7370±8014C years) BP, when the sea crossed a threshold lying at -0.08m OD (-2.17m MHWS) before withdrawing. This could have been due to a storm or to the Holocene Storegga Slide tsunami. By 6407-6122 (5500±60) BP, relative sea levels had begun to fall from a sandflat surface with an indicated MHWS level of between 0.08 and - 1.96m (-2.01 to -4.05m). This fall reached between -0.30 and -2.35m (-2.39 to -4.44m) after 5841-5050 (4760±130) BP, but was succeeded by a relative sea level rise which reached between 0.54 and -1.57m (-1.55 to -3.66m) by 5450-4861 (4500±100) BP. This rise continued, possibly with an interruption, until a second sandflat surface was reached
    between 2.34 and -0.26m (0.25 to -2.35m) between 2952-3375 (3000±80) and 1948-2325 (2130±70) BP, before present levels were reached. The regressive episode from the earliest sandflat is correlated with the abandonment of the Main Postglacial Shoreline. It is maintained that the fluctuations in relative sea level recorded can be correlated with similar events elsewhere on the periphery of the glacio-isostatic centre and may therefore reflect secular changes in nearshore sea surface levels. Despite published evidence from trim lines
    of differential ice sheet loading across the area, no evidence of variations in uplift between the locations concerned could be found.
    Original languageEnglish
    Publication statusPublished - Jan 2010
    EventQRA Annual Meeting
    - Durham, United Kingdom
    Duration: 5 Jan 20108 Jan 2010
    https://www.dur.ac.uk/geography/slru/qra-agm-2010/programme/

    Conference

    ConferenceQRA Annual Meeting
    CountryUnited Kingdom
    CityDurham
    Period5/01/108/01/10
    Internet address

    Fingerprint

    sea level change
    Holocene
    sea level
    sea surface
    uplift
    radiocarbon dating
    Postglacial
    tsunami
    ice sheet
    shoreline
    diatom
    grain size
    ice
    coast
    sea
    sea level rise
    index
    analysis

    Bibliographical note

    This paper was an oral presentation. The full abstract is available from the link given (page 19).
    Presented at the Quaternary Research Association Annual Discussion Meeting: Sea-level Changes: the Science of a Changing World. Held 5-8 January 2010 at Durham University, UK. The conference website can be found at http://www.dur.ac.uk/geography/conferences/qra/
    See also:
    Jordan, J.T. , Smith, D.E. , Dawson, S. and Dawson, A.G. (2010) Holocene relative sea-level changes in Harris, Outer Hebrides, Scotland, UK. Journal of Quaternary Science, volume 25 (2): 115-134
    http://curve.coventry.ac.uk/open/items/1b19ab61-4a76-154d-d9c1-1a3a29855f21/1/

    Keywords

    • relative sea level
    • holocene

    Cite this

    Jordan, J. T., Smith, D., Dawson, S., & Dawson, A. (2010). Holocene relative sea level change in the Outer Hebrides, Scotland, UK. Abstract from QRA Annual Meeting
    , Durham, United Kingdom.

    Holocene relative sea level change in the Outer Hebrides, Scotland, UK. / Jordan, Jason T.; Smith, D.; Dawson, S.; Dawson, A.

    2010. Abstract from QRA Annual Meeting
    , Durham, United Kingdom.

    Research output: Contribution to conferenceAbstract

    Jordan, JT, Smith, D, Dawson, S & Dawson, A 2010, 'Holocene relative sea level change in the Outer Hebrides, Scotland, UK' QRA Annual Meeting
    , Durham, United Kingdom, 5/01/10 - 8/01/10, .
    Jordan JT, Smith D, Dawson S, Dawson A. Holocene relative sea level change in the Outer Hebrides, Scotland, UK. 2010. Abstract from QRA Annual Meeting
    , Durham, United Kingdom.
    Jordan, Jason T. ; Smith, D. ; Dawson, S. ; Dawson, A. / Holocene relative sea level change in the Outer Hebrides, Scotland, UK. Abstract from QRA Annual Meeting
    , Durham, United Kingdom.
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    N2 - Evidence for relative sea level changes during the middle and late Holocene is examined from two locations on the Atlantic coast of Harris, Outer Hebrides, Scotland, using morphological mapping and survey, stratigraphical, grain size and diatom analysis, and radiocarbon dating. The objective was to determine whether this location, peripheral to a glacio-isostatic uplift centre, would register fluctuations in the nearshore sea surface and whether local variations in ice loading might be detected in the altitudes of sea level index points. The earliest event identified is a marine flood, which occurred after 7982-8348calibrated years (7370±8014C years) BP, when the sea crossed a threshold lying at -0.08m OD (-2.17m MHWS) before withdrawing. This could have been due to a storm or to the Holocene Storegga Slide tsunami. By 6407-6122 (5500±60) BP, relative sea levels had begun to fall from a sandflat surface with an indicated MHWS level of between 0.08 and - 1.96m (-2.01 to -4.05m). This fall reached between -0.30 and -2.35m (-2.39 to -4.44m) after 5841-5050 (4760±130) BP, but was succeeded by a relative sea level rise which reached between 0.54 and -1.57m (-1.55 to -3.66m) by 5450-4861 (4500±100) BP. This rise continued, possibly with an interruption, until a second sandflat surface was reachedbetween 2.34 and -0.26m (0.25 to -2.35m) between 2952-3375 (3000±80) and 1948-2325 (2130±70) BP, before present levels were reached. The regressive episode from the earliest sandflat is correlated with the abandonment of the Main Postglacial Shoreline. It is maintained that the fluctuations in relative sea level recorded can be correlated with similar events elsewhere on the periphery of the glacio-isostatic centre and may therefore reflect secular changes in nearshore sea surface levels. Despite published evidence from trim linesof differential ice sheet loading across the area, no evidence of variations in uplift between the locations concerned could be found.

    AB - Evidence for relative sea level changes during the middle and late Holocene is examined from two locations on the Atlantic coast of Harris, Outer Hebrides, Scotland, using morphological mapping and survey, stratigraphical, grain size and diatom analysis, and radiocarbon dating. The objective was to determine whether this location, peripheral to a glacio-isostatic uplift centre, would register fluctuations in the nearshore sea surface and whether local variations in ice loading might be detected in the altitudes of sea level index points. The earliest event identified is a marine flood, which occurred after 7982-8348calibrated years (7370±8014C years) BP, when the sea crossed a threshold lying at -0.08m OD (-2.17m MHWS) before withdrawing. This could have been due to a storm or to the Holocene Storegga Slide tsunami. By 6407-6122 (5500±60) BP, relative sea levels had begun to fall from a sandflat surface with an indicated MHWS level of between 0.08 and - 1.96m (-2.01 to -4.05m). This fall reached between -0.30 and -2.35m (-2.39 to -4.44m) after 5841-5050 (4760±130) BP, but was succeeded by a relative sea level rise which reached between 0.54 and -1.57m (-1.55 to -3.66m) by 5450-4861 (4500±100) BP. This rise continued, possibly with an interruption, until a second sandflat surface was reachedbetween 2.34 and -0.26m (0.25 to -2.35m) between 2952-3375 (3000±80) and 1948-2325 (2130±70) BP, before present levels were reached. The regressive episode from the earliest sandflat is correlated with the abandonment of the Main Postglacial Shoreline. It is maintained that the fluctuations in relative sea level recorded can be correlated with similar events elsewhere on the periphery of the glacio-isostatic centre and may therefore reflect secular changes in nearshore sea surface levels. Despite published evidence from trim linesof differential ice sheet loading across the area, no evidence of variations in uplift between the locations concerned could be found.

    KW - relative sea level

    KW - holocene

    M3 - Abstract

    ER -