ArticleScience advances2021
A long-term record of early to mid-Paleozoic marine redox change.
Article in Science advances, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers.
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Who cites it
14 citing papers in PubMed, 79 citations in OpenAlex.
- The evolution of the Earth's surface iron cycle.Proceedings of the National Academy of Sciences of the United States of America · 2026Article
- Cooling-induced intensification of ocean anoxia in the mid-Paleozoic.Science advances · 2026Article
- Dynamic redox-promoted iron and nutrient cycling drove graptolite evolution across the Ordovician-Silurian transition.Science advances · 2026Article
- Dynamic deep marine oxygenation during the Early and Middle Paleozoic.Science advances · 2025Article
- The sub-arc mantle has remained oxidized since the Neoproterozoic oxygenation event.Nature communications · 2025Article
- Mineralogical controls of the oceanic nickel cycle.Nature communications · 2025Article
- Marine sulphate captures a Paleozoic transition to a modern terrestrial weathering environment.Nature communications · 2025Article
- Late Paleozoic oxygenation of marine environments supported by dolomite U-Pb dating.Nature communications · 2024Article
- Mesoproterozoic surface oxygenation accompanied major sedimentary manganese deposition at 1.4 and 1.1 Ga.Geobiology · 2023Article
- Article
- Pyrite mega-analysis reveals modes of anoxia through geological time.Science advances · 2022Article
- Temporal variation of planetary iron as a driver of evolution.Proceedings of the National Academy of Sciences of the United States of America · 2021Article
- Decreasing Phanerozoic extinction intensity as a consequence of Earth surface oxygenation and metazoan ecophysiology.Proceedings of the National Academy of Sciences of the United States of America · 2021Article
- Article
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Authors and funding
20 authors at 12 institutions in 5 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The extent to which Paleozoic oceans differed from Neoproterozoic oceans and the causal relationship between biological evolution and changing environmental conditions are heavily debated. Here, we report a nearly continuous record of seafloor redox change from the deep-water upper Cambrian to Middle Devonian Road River Group of Yukon, Canada. Bottom waters were largely anoxic in the Richardson trough during the entirety of Road River Group deposition, while independent evidence from iron speciation and Mo/U ratios show that the biogeochemical nature of anoxia changed through time. Both in Yukon and globally, Ordovician through Early Devonian anoxic waters were broadly ferruginous (nonsulfidic), with a transition toward more euxinic (sulfidic) conditions in the mid-Early Devonian (Pragian), coincident with the early diversification of vascular plants and disappearance of graptolites. This ~80-million-year interval of the Paleozoic characterized by widespread ferruginous bottom waters represents a persistence of Neoproterozoic-like marine redox conditions well into the Phanerozoic.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.