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

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 journal › Article › peer-review

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.

Original language	English
Pages (from-to)	349-353
Journal	Journal of Coastal Research
Volume	S.I. 7
Publication status	Published (in print/issue) - 29 Apr 2014

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

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.",

author = "Alan Smith and Andy Green and Andrew Cooper and Shannon Dixon and Lauren Pretorius and Errol Wiles and lisa Guastella",

year = "2014",

month = apr,

day = "29",

language = "English",

volume = "S.I. 7",

pages = "349--353",

journal = "Journal of Coastal Research",

issn = "1551-5036",

publisher = "Coastal Education and Research Foundation",

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TY - JOUR

T1 - Cliff-top storm deposits (55-63m amsl) from Morgan Bay, South Africa

AU - Smith, Alan

AU - Green, Andy

AU - Cooper, Andrew

AU - Dixon, Shannon

AU - Pretorius, Lauren

AU - Wiles, Errol

AU - Guastella, lisa

PY - 2014/4/29

Y1 - 2014/4/29

N2 - 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.

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.

M3 - Article

SN - 1551-5036

VL - S.I. 7

SP - 349

EP - 353

JO - Journal of Coastal Research

JF - Journal of Coastal Research

ER -

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

Abstract

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