Understanding fossil phytolith preservation: The role of partial dissolution in paleoecology and archaeology

Dan Cabanes, Ruth Shahack-Gross

Research output: Contribution to journalArticlepeer-review

103 Scopus citations

Abstract

Opaline phytoliths are important microfossils used for paleoecological and archaeological reconstructions that are primarily based on relative ratios of specific morphotypes. Recent studies have shown that phytolith assemblages are prone to post-depositional alteration involving partial dissolution, however, the manner in which partial dissolution affects morphotype composition is poorly understood. Here we show that morphotype assemblages from four different plant species subjected to controlled partial dissolution are significantly different from the original assemblages, indicating that the stability of various morphotypes differs, mainly depending on their surface area to bulk ratios. This underlying mechanism produces distorted morphotype compositions in partially dissolved phytolith assemblages, bearing vast implications for morphotype-based paleoecological and archaeological interpretation. Together with analyses of phytolith assemblages from a variety of archaeological sites, our results establish criteria by which well-preserved phytolith assemblages can be selected for accurate paleoecological and archaeological reconstructions.

Original languageEnglish
Article numbere0125532
JournalPLoS ONE
Volume10
Issue number5
DOIs
StatePublished - 20 May 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 Cabanes, Shahack-Gross. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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