Beachrock variability and sea level implications from a subtropical coastal setting: a preliminary study

Chris Kelly, Andy Green, Andrew Cooper, Errol Wiles

Research output: Contribution to journalArticle

Abstract

In spite of the worldwide abundance of beachrocks and their acknowledged utility as an indicator of former sea level position, some studies have expressed doubt as to their position of cementation on paleo shorelines. These criticisms are not, however, coupled with nuanced sedimentological studies of beachrocks. Instead, few beachrock studies acknowledge any facies and therefore disregard important signatures of the depositional environment and, consequently, utility as paleo sea level indicators. This study presents detailed sedimentological descriptions and interpretations from two beachrock localities along the subtropical, microtidal, wave-dominated eastern coastline near Durban, South Africa. The outcrops record the migration of a paleo inlet and deposition in sub, inter, and supra tidal environments. Understanding the inferred depositional environment, and observed stratigraphic relationships between various beachrock facies is critical to teasing out the local evolution of shoreline and relative sea level. The outcrops studied here record multiple episodes of Holocene sea level rise and fall.
Original languageEnglish
Pages (from-to)736-742
JournalJournal of Coastal Research
VolumeS.I. 7
Publication statusPublished - 28 Apr 2014

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