Biogeosciences
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Articles | Volume 18, issue 22
Articles | Volume 18, issue 22
https://doi.org/10.5194/bg-18-5929-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-18-5929-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 18, issue 22
Research article
 | 
22 Nov 2021
Research article |  | 22 Nov 2021

Pyrite-lined shells as indicators of inefficient bioirrigation in the Holocene–Anthropocene stratigraphic record

Adam Tomašových, Michaela Berensmeier, Ivo Gallmetzer, Alexandra Haselmair, and Martin Zuschin

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Latest update: 17 May 2025
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Short summary
The timescale of mixing and irrigation of sediments by burrowers that affect biogeochemical cycles is difficult to estimate in the stratigraphic record. We show that pyrite linings in molluscan shells preserved below the mixed layer represent a signature of limited bioirrigation. We document an increase in the frequency of pyrite-lined shells in cores collected in the northern Adriatic Sea, suggesting that bioirrigation rates significantly declined during the late 20th century.
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