Soft-Bodied Fossils Are Not Simply Rotten Carcasses – Toward a Holistic Understanding of Exceptional Fossil Preservation: Exceptional Fossil Preservation Is Complex and Involves the Interplay of Numerous Biological and Geological Processes

Luke A. Parry, Fiann Smithwick, Klara K. Nordén, Evan T. Saitta, Jesus Lozano-Fernandez, Alastair R. Tanner, Jean Bernard Caron, Gregory D. Edgecombe, Derek E.G. Briggs, Jakob Vinther*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

31 Citations (Scopus)
268 Downloads (Pure)

Abstract

Exceptionally preserved fossils are the product of complex interplays of biological and geological processes including burial, autolysis and microbial decay, authigenic mineralization, diagenesis, metamorphism, and finally weathering and exhumation. Determining which tissues are preserved and how biases affect their preservation pathways is important for interpreting fossils in phylogenetic, ecological, and evolutionary frameworks. Although laboratory decay experiments reveal important aspects of fossilization, applying the results directly to the interpretation of exceptionally preserved fossils may overlook the impact of other key processes that remove or preserve morphological information. Investigations of fossils preserving non-biomineralized tissues suggest that certain structures that are decay resistant (e.g., the notochord) are rarely preserved (even where carbonaceous components survive), and decay-prone structures (e.g., nervous systems) can fossilize, albeit rarely. As we review here, decay resistance is an imperfect indicator of fossilization potential, and a suite of biological and geological processes account for the features preserved in exceptional fossils.

Original languageEnglish
Article number1700167
JournalBioEssays
Volume40
Issue number1
Early online date29 Nov 2017
DOIs
Publication statusPublished - 1 Jan 2018

Keywords

  • decay experiments
  • exceptional preservation
  • Lagerstätten
  • taphonomy

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