Cliff-top storm deposits (55-63m amsl) from Morgan Bay, South Africa

Alan Smith, Andy Green, Andrew Cooper, Shannon Dixon, Lauren Pretorius, Errol Wiles, lisa Guastella

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Cliff-top storm deposits (CTSDs) occur south of Morgan Bay, South Africa at elevations varying from ±55- to 63m. These occur as a ±10m-wide horizontal fringe of shell breccia mixed into a very thin (>15cm) sandy soil on the cliff top platform. Visually it is evident that the shell breccia is of various ages. Comparisons with proven wave breccia from this area indicate the same source. We suggest that this breccia was deposited as fall-out fromwave and wind-borne plumes produced by wave bores striking the cliff base. These bores would likely have been produced by waves at least ~40m in height. Alternative interpretations, such as a perched marine deposit or tsunamiite are rejected in favour of CTSDs produced by multiple large wave events.
LanguageEnglish
Pages349-353
JournalJournal of Coastal Research
VolumeS.I. 7
Publication statusPublished - 29 Apr 2014

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storm deposit
breccia
cliff
shell
sandy soil
plume
Africa

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Smith, A., Green, A., Cooper, A., Dixon, S., Pretorius, L., Wiles, E., & Guastella, L. (2014). Cliff-top storm deposits (55-63m amsl) from Morgan Bay, South Africa. Journal of Coastal Research, S.I. 7, 349-353.
Smith, Alan ; Green, Andy ; Cooper, Andrew ; Dixon, Shannon ; Pretorius, Lauren ; Wiles, Errol ; Guastella, lisa. / Cliff-top storm deposits (55-63m amsl) from Morgan Bay, South Africa. In: Journal of Coastal Research. 2014 ; Vol. S.I. 7. pp. 349-353.
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Smith, A, Green, A, Cooper, A, Dixon, S, Pretorius, L, Wiles, E & Guastella, L 2014, 'Cliff-top storm deposits (55-63m amsl) from Morgan Bay, South Africa', Journal of Coastal Research, vol. S.I. 7, pp. 349-353.

Cliff-top storm deposits (55-63m amsl) from Morgan Bay, South Africa. / Smith, Alan; Green, Andy; Cooper, Andrew; Dixon, Shannon; Pretorius, Lauren; Wiles, Errol; Guastella, lisa.

In: Journal of Coastal Research, Vol. S.I. 7, 29.04.2014, p. 349-353.

Research output: Contribution to journalArticle

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AU - Wiles, Errol

AU - Guastella, lisa

PY - 2014/4/29

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AB - Cliff-top storm deposits (CTSDs) occur south of Morgan Bay, South Africa at elevations varying from ±55- to 63m. These occur as a ±10m-wide horizontal fringe of shell breccia mixed into a very thin (>15cm) sandy soil on the cliff top platform. Visually it is evident that the shell breccia is of various ages. Comparisons with proven wave breccia from this area indicate the same source. We suggest that this breccia was deposited as fall-out fromwave and wind-borne plumes produced by wave bores striking the cliff base. These bores would likely have been produced by waves at least ~40m in height. Alternative interpretations, such as a perched marine deposit or tsunamiite are rejected in favour of CTSDs produced by multiple large wave events.

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Smith A, Green A, Cooper A, Dixon S, Pretorius L, Wiles E et al. Cliff-top storm deposits (55-63m amsl) from Morgan Bay, South Africa. Journal of Coastal Research. 2014 Apr 29;S.I. 7:349-353.