The sedimentology of Middle Holocene tsunami facies in northern Sutherland, Scotland, UK

S. Dawson (Lead / Corresponding author), D. E. Smith

Research output: Contribution to journalArticle

76 Citations (Scopus)

Abstract

Lagoonal sediments attributed to the main Holocene marine transgression in Strath Halladale, northern Sutherland, contain a complex coarser layer believed to have been deposited during the tsunami associated with the Second Storegga Slide off South West Norway. The coarser sequence is dated at between 7590 ± 50 and 7290 ± 50 radiocarbon years BP (6507-6260 cal BC and 6228-6029 cal BC). Detailed stratigraphical analysis has determined a distinctive suite of sedimentary sub-units within the coarser layer in marked contrast to the sediments, which occur above, and below. A pronounced erosional unconformity with the underlying sediments is recorded with the base of the tsunami layer characterised by eroded material from the underlying peat. The presence of a mixed diatom assemblage, although fragmentary, indicates a chaotic accumulation of the deposit with all habitats represented. Variations in particle size within the sequence disclose striking similarities with those from contemporary tsunami deposits. The run-up of the tsunami sediments is calculated at a minimum of 4.6 m. This is the first occasion on which a deposit of the Second Storegga Slide tsunami has been found outside the North Sea basin and indicates that the area affected by the tsunami may have been larger than has been previously described. (C) 2000 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)69-79
Number of pages11
JournalMarine Geology
Volume170
Issue number1-2
DOIs
Publication statusPublished - 30 Oct 2000

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Sedimentology
Tsunamis
sedimentology
tsunami
Holocene
Sediments
Deposits
sediment
Peat
transgression
unconformity
peat
diatom
Particle size
particle size
habitat
basin

Keywords

  • Diatoms
  • Holocene
  • Sedimentology
  • Tsunami

Cite this

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abstract = "Lagoonal sediments attributed to the main Holocene marine transgression in Strath Halladale, northern Sutherland, contain a complex coarser layer believed to have been deposited during the tsunami associated with the Second Storegga Slide off South West Norway. The coarser sequence is dated at between 7590 ± 50 and 7290 ± 50 radiocarbon years BP (6507-6260 cal BC and 6228-6029 cal BC). Detailed stratigraphical analysis has determined a distinctive suite of sedimentary sub-units within the coarser layer in marked contrast to the sediments, which occur above, and below. A pronounced erosional unconformity with the underlying sediments is recorded with the base of the tsunami layer characterised by eroded material from the underlying peat. The presence of a mixed diatom assemblage, although fragmentary, indicates a chaotic accumulation of the deposit with all habitats represented. Variations in particle size within the sequence disclose striking similarities with those from contemporary tsunami deposits. The run-up of the tsunami sediments is calculated at a minimum of 4.6 m. This is the first occasion on which a deposit of the Second Storegga Slide tsunami has been found outside the North Sea basin and indicates that the area affected by the tsunami may have been larger than has been previously described. (C) 2000 Elsevier Science B.V.",
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The sedimentology of Middle Holocene tsunami facies in northern Sutherland, Scotland, UK. / Dawson, S. (Lead / Corresponding author); Smith, D. E.

In: Marine Geology, Vol. 170, No. 1-2, 30.10.2000, p. 69-79.

Research output: Contribution to journalArticle

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