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Reply to Butterfield :
Reply to Butterfield : The Devonian radiation of large predatory fish coincided with elevated athospheric oxygen levels
- Article/chapterEnglish2011
Publisher, publication year, extent ...
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2011-02-16
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Proceedings of the National Academy of Sciences,2011
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:su-65878
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-65878URI
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https://doi.org/10.1073/pnas.1018818108DOI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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8
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We welcome this opportunity to clarify the conclusions and implications of our recent publication in PNAS. Butterfield (1) raises four issues regarding the oxygenation of the Paleozoic Earth's surface and its correlation to animal evolution. Our geochemical and paleontological data supported ocean oxygenation in the Silurian-Early Devonian (2), a critical transition in Earth history that influenced biogeochemical cycles and biological systems. First, Butterfield suggests that evidence of charcoal in late Silurian rocks is incompatible with our claim that the earlier Paleozoic atmosphere had oxygen levels below 50% PAL (present-day atmospheric level). This counterargument rests on the assumption that the “fire window” of 62–166% PAL oxygen is well defined, but this is not the case (3).
Subject headings and genre
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Hammarlund, Emma U.,1971-Stockholms universitet,Institutionen för geologiska vetenskaper
(author)
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Anbar, Ariel D.
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Bond, David P. G.
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Gill, Benjamin C.
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Gordon, Gwyneth W.
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Knoll, Andrew H.
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Canfield, Donald E.
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Stockholms universitetInstitutionen för geologiska vetenskaper
(creator_code:org_t)
Related titles
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In:Proceedings of the National Academy of Sciences of the United States of America: Proceedings of the National Academy of Sciences108:9, s. E29-0027-84241091-6490
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