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During this time, the minor Smithian\u2010Spathian extinction occurred, further delaying the biotic recovery of this epoch. One mechanism linked to the slow recovery is widespread marine anoxic conditions, but the spatiotemporal changes to anoxia following the mass extinction remain poorly constrained. Here, we utilized local and global redox\u2010sensitive metal proxies to track variations in (de\u2010)oxygenation at Wallenbergfjellet, a section in Spitsbergen, Arctic Norway. Local proxies (e.g., Fe speciation and trace metal concentrations) indicate basinal anoxia and possibly euxinia prevalent in the Boreal Ocean during this interval. Importantly, thallium isotopes, a global paleoredox proxy sensitive to Mn oxide burial, have not previously been applied to the Early Triassic recovery interval that followed the end\u2010Permian mass extinction, though basinal restriction may limit geographic extent of interpretations. Our results show a shift in \u03b5\n                    <jats:sup>205<\/jats:sup>\n                    Tl values from ~ \u22124.0 in the Smithian to ~ \u22122.0 at the Smithian\u2010Spathian boundary (SSB), consistent with a rapid expansion of global anoxia coincident with the boundary extinction. A rapid perturbation in thallium isotopes at the SSB (from \u22124.0 to \u22122.0 \u03b5\u2010units) indicates this interval experienced an expansion of anoxic conditions that can be linked to the minor extinction event during the recovery interval following the end\u2010Permian mass extinction. This suggests that global anoxia persisted throughout the Early Triassic and contributed to delayed biotic recovery, with the SSB representing a major intensification of reducing conditions.\n                  <\/jats:p>","DOI":"10.1111\/gbi.70062","type":"journal-article","created":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T06:59:17Z","timestamp":1788418757000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Thallium Isotopes Across the Smithian\u2010Spathian Boundary: Evidence for Anoxia Throughout Most of the Early Triassic"],"prefix":"10.1111","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6585-095X","authenticated-orcid":false,"given":"Sean M.","family":"Newby","sequence":"first","affiliation":[{"name":"Earth, Ocean, and Atmospheric Science Department National High Magnetic Field Laboratory, Florida State University  Tallahassee Florida USA"},{"name":"Department of Earth and Planetary Sciences University of Hong Kong  Hong Kong Hong Kong SAR"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0530-2177","authenticated-orcid":false,"given":"Jeremy D.","family":"Owens","sequence":"additional","affiliation":[{"name":"Earth, Ocean, and Atmospheric Science Department National High Magnetic Field Laboratory, Florida State University  Tallahassee Florida USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6885-4780","authenticated-orcid":false,"given":"Seth A.","family":"Young","sequence":"additional","affiliation":[{"name":"Earth, Ocean, and Atmospheric Science Department National High Magnetic Field Laboratory, Florida State University  Tallahassee Florida USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"\u00d8yvind","family":"Hammer","sequence":"additional","affiliation":[{"name":"Natural History Museum, University of Oslo  Oslo Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,2]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.palaeo.2011.01.011"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.palaeo.2010.07.007"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chemgeo.2003.12.009"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chemgeo.2009.09.001"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chemgeo.2020.119627"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41561\u2010018\u20100261\u2010y"},{"key":"e_1_2_10_8_1","unstructured":"Blakey R. 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