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Submerged Upper Holocene beachrock on San Salvador Island, Bahamas: implications for recent sea-level history

Published inGeologische Rundschau, vol. 82, no. 2, p. 241-247
Publication date1993
Abstract

Sedimentological, petrographic and radiometric data from a submerged beachrock on San Salvador Island, Bahamas, provide new information about the Late Holocene sea-level history in this area. At French Bay, on the southern shore of the island, samples of beachrock collected at a depth of 1 m below low tide level yielded an average 14C age of 965 ± 60 years before present. These samples further display a well developed fenestral porosity and present an early generation of low Mg calcite meniscus cement. These features characterize intertidal and supratidal settings; they are not consistent with the present beachrock position and the reported Late Holocene sea-level history in the Bahamas. A 1.5 -2 m low stand of the sea about 1000 years ago would best explain the observed particularities of the French Bay beachrock. This example from San Salvador shows that the smooth trend of Late Holocene sea-level rise proposed by previous workers might be overprinted by high frequency, low amplitude fluctuations. Recognition of these fluctuations is fundamental when calculating rates of sea-level rise and evaluating the coastal response to a marine transgression.

eng
Keywords
  • Sea-level history
  • Bahamas
  • Beachrocks
  • Holocene
  • Carbonates
Citation (ISO format)
KINDLER, Pascal, BAIN, Roger J. Submerged Upper Holocene beachrock on San Salvador Island, Bahamas: implications for recent sea-level history. In: Geologische Rundschau, 1993, vol. 82, n° 2, p. 241–247. doi: 10.1007/BF00191830
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ISSN of the journal0016-7835
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