Submerged shorelines and landscape features offshore of mossel bay, South Africa

Hayley C. Cawthra, John S. Compton, Erich C. Fisher, Michaelr Machutchon, Curtis Marean

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Coastal geomorphic systems have been studied widely to understand the responses of shorelines to fluctuating sea levels. Submerged shorelines, remnant of pleistocene sea-level lowstands, are well preserved on the south african continental shelf. This paper describes work undertaken to better understand offshore coastal environments now submerged by high sea levels off the south african south coast near mossel bay, offshore of the pinnacle point archaeological locality. Multibeam bathymetry and side-scan sonar reveal evidence of past sea-level fluctuations and submerged coastal landscape features on the seabed. These results form the basis of an ongoing palaeoenvironmental reconstruction for this part of the shelf. We describe seven significant geomorphic features that show a submerged environment that differs significantly to the immediate adjacent coastal plain. However, these features are comparable to other stretches of the present south african shoreline that serve as modern analogues.We propose that features on the continental shelf primarily reflect geological substrate, gradients and pleistocene sea-level fluctuations. Early modern humans were likely to have had a different set of resources to use inthis pleistocene landscape compared to those available along the presently exposed coast.

Original languageEnglish (US)
Pages (from-to)219-233
Number of pages15
JournalGeological Society Special Publication
Volume411
Issue number1
DOIs
StatePublished - 2016

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ASJC Scopus subject areas

  • Ocean Engineering
  • Water Science and Technology
  • Geology

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