Glacial and postglacial sedimentation in the Sea of the Hebrides

Binns, P. E.; Harland, Rex; Hughes, M. J.

doi:10.1038/248751a0

Cited by 47 publications

(25 citation statements)

References 2 publications

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“…A direct link with events on land is provided by marine deposits with a cold water fauna (Loch Lomond Stadial) overlying deposits related to milder conditions and underlying postglacial deposits. This sequence has been identified near Colonsay from study of foraminifers and dynoflagellate cysts (P. E. Binns et al 1974) and in the Cromarty Firth from molluscs, foraminifers and ostracods (Peacock in press).…”

Section: Sea Level Changesmentioning

confidence: 94%

The Quaternary in Scotland: a review

Sissons

1975

SJG

120

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SYNOPSISOnly two interglacial pollen sites are known in Scotland, both in Shetland. There is at present no satisfactory evidence that the decay of the last ice-sheet was interrupted by a significant readvance. Decay was probably complete by 12 500. The Loch Lomond Readvance, which probably began before 10 800, is associated with excellent end moraines (often, significantly, multiple) at more than 100 locations. Former firn lines can be calculated and palaeoclimatic inferences made. The mapped limit of the readvance accords with the distribution of 58 lateglacial pollen sites. Periglacial processes currently operate on the Scottish mountains but were extremely active during the Loch Lomond Readvance, when permafrost (with frost wedges) existed down to sea-level. A summary of the sequence of lateglacial and postglacial sea-level changes (especially in the southeast) includes re-dating of the low-level rock platform and cliff of western Scotland and leads to an unconventional mode of deglaciation for the Glasgow area.CONTENTS

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Section: Sea Level Changesmentioning

confidence: 94%

The Quaternary in Scotland: a review

Sissons

1975

SJG

120

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“…The seismic characteristics observed in this succession are typical of marine or glacio-marine sediments rather than of till or boulder clay (Binns et al 1974;Holmes 1977). This interpretation is confirmed by results obtained from borehole 75/40 in which the lithologic succession found was as follows: Analysis of the dinoflagellate cyst content of the clays (R. Harland, pers.…”

Section: The Geology Of the Areamentioning

confidence: 98%

The geology and origin of narrow closed channels in the Sound of Jura

Evans

Ruckley

1980

SJG

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SYNOPSISGeological and geophysical investigations in the southern part of the Sound of Jura reveal numerous deep and narrow closed channels in a sequence of thick post-glacial muds. It is proposed that the channels were formed subsequent to the deposition of the sediments by the erosive action of the strong tides observed in the Sound. Several problems related to this mode of origin are considered, but more data are required to provide greater insight into the post-glacial history of the Sound.

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“…The individual contributions of waves and tides to net bed shear stress had a similarly complex spatial and temporal evolution over this period (Van der Molen and de Swart 2001b; Neill et al 2009), leading to dynamic regime shifts observable in sedimentary sequences (e.g. Binns et al 1974;Van Landeghem et al 2009). To obtain a shelf-wide perspective at a consistent temporal and spatial resolution, numerical model studies are essential to elucidate and corroborate such observed complexity (e.g.…”

Section: Introductionmentioning

confidence: 98%

Evolution of bed shear stress distribution over the northwest European shelf seas during the last 12,000 years

2010

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Due to changes in relative sea level of order 100 m, the contribution of tides and waves to net bed shear stress in shelf sea regions has varied considerably over the Late Glacial and Holocene. Understanding the spatial and temporal distribution of this ratio leads to a deeper understanding of the erosion and deposition of sediments over the shelf seas throughout this time period. Tidal and wave models are here applied to palaeo time slices of the northwest European shelf seas over the last 12,000 years. The model simulations include a series of sensitivity tests to account for the influence of interannual variability in wind conditions on the resulting bed shear stress. The results show that there has been a significant decrease over the last 12,000 years in shelf-scale mobilisation of coarse sediment. Since there was a lower magnitude of wave orbital velocity penetrating to the sea bed as a result of increasing relative sea level, this reduction in sediment Responsible Editor: Birgit Andrea Klein Electronic supplementary material The online version of this article (mobilisation was primarily controlled by a shelf-scale decrease in wave-induced bed shear stress over the last 12,000 years. The predictions of mean and residual bed shear stress for the modelled palaeo time slices are a useful tool with which to inform site-selection and subsequent interpretation of sediment cores. In addition, the modelled reconstructions of palaeo tidal range over the shelf seas demonstrates the potential errors associated with assuming a present-day tidal range when correcting palaeo sea-level proxies from their deposited datum (e.g. palaeo mean high water spring tide) to palaeo mean sea level.

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Glacial and postglacial sedimentation in the Sea of the Hebrides

Cited by 47 publications

References 2 publications

The Quaternary in Scotland: a review

The Quaternary in Scotland: a review

The geology and origin of narrow closed channels in the Sound of Jura

Evolution of bed shear stress distribution over the northwest European shelf seas during the last 12,000 years

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