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A sustained +21 m sea-level highstand during MIS 11 (400 ka): direct fossil and sedimentary evidence from Bermuda

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dc.contributor.author Olson, Storrs L. en
dc.contributor.author Hearty, Paul J. en
dc.date.accessioned 2009-06-08T13:09:23Z
dc.date.available 2009-06-08T13:09:23Z
dc.date.issued 2009
dc.identifier.citation Olson, Storrs L. and Hearty, Paul J. 2009. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F7516">A sustained +21 m sea-level highstand during MIS 11 (400 ka): direct fossil and sedimentary evidence from Bermuda</a>." <em>Quaternary Science Reviews</em>. 28 (3-4):271&ndash;285. <a href="https://doi.org/10.1016/j.quascirev.2008.11.001">https://doi.org/10.1016/j.quascirev.2008.11.001</a> en
dc.identifier.issn 0277-3791
dc.identifier.uri http://hdl.handle.net/10088/7516
dc.description.abstract A small, protected karstic feature exposed in a limestone quarry in Bermuda preserved abundant sedimentary and biogenic materials documenting a transgressive phase, still-stand, and regressive phase of a sea-level in excess of 21.3 m above present during Marine Isotope Stage (MIS) 11 (400 ka) as determined by U/Th dating and amino acid racemization. Cobbles and marine sediments deposited during the high-energy transgressive phase exhibit rim cements indicating a subsequent phreatic environment. This was succeeded stratigraphically by a still-stand deposition of fine calcareous lagoonal sediments containing bioclasts of red algae and benthic and planktonic foraminifera that was intensely burrowed by marine invertebrates, probably upogebiid shrimp, that could not be produced under any condition other than sustained marine submergence. Overlying this were pure carbonate beach sands of a low-energy regressive phase containing abundant remains of terrestrial and marine vertebrates and invertebrates. The considerable diversity of this fauna along with taphonomic evidence from seabird remains indicates deposition by high run-up waves over a minimum duration of months, if not years. The maximum duration has yet to be determined but probably did not exceed one or two thousand years. The most abundant snails in this fauna are two species indicative of brackish water and high-tide line showing that a Ghyben-Herzberg lens must have existed at &gt; + 20 m. The nature of these sediments and fossil accumulation is incompatible with tsunami deposition and, given the absence of evidence for tectonic uplift of the Bermuda pedestal or platform, provide proof that sea-level during MIS 11 exceeded +20 m, a fact that has widespread ramifications for geologists, biogeographers, and human demographics along the world&#39;s coastlines. en
dc.format.extent 1333579 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.relation.ispartof Quaternary Science Reviews en
dc.title A sustained +21 m sea-level highstand during MIS 11 (400 ka): direct fossil and sedimentary evidence from Bermuda en
dc.type Journal Article en
dc.identifier.srbnumber 77213
dc.identifier.doi 10.1016/j.quascirev.2008.11.001
rft.jtitle Quaternary Science Reviews
rft.volume 28
rft.issue 3-4
rft.spage 271
rft.epage 285
dc.description.SIUnit NH-Vertebrate Zoology en
dc.description.SIUnit NMNH en
dc.citation.spage 271
dc.citation.epage 285

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