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Taxon-specific redox conditions control fossilisation pathways.

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Fossil preservation is linked to redox processes. Different organisms create unique redox conditions during decay, influencing fossilization patterns even in the same environment.

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Area of Science:

  • Geochemistry
  • Taphonomy
  • Paleontology

Background:

  • Fossil preservation relies on complex redox processes.
  • Experimental taphonomy rarely monitors redox changes around decaying organisms.

Purpose of the Study:

  • To experimentally measure redox changes around various decaying taxa.
  • To understand how different organisms influence post-mortem redox environments.

Main Methods:

  • Utilized microsensors to monitor redox potential.
  • Investigated decomposition of shrimp, snail, starfish, and planarian carcasses.

Main Results:

  • Decaying taxa generate distinct post-mortem redox conditions.
  • Larger carcasses and those with higher protein/carbohydrate content reach reducing conditions faster.
  • Organismal composition significantly impacts redox environment development.

Conclusions:

  • Taxa-specific redox environments can lead to varied fossilization patterns within a single sedimentary layer.
  • This explains the co-occurrence of different macrofossil and molecular preservation states.