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Regular steranes, lipid biomarkers primarily sourced from eukaryotes, are first unambiguously reported from multiple sites. Here, we present lipid biomarker stratigraphic records from two drill\u2010cores from the Lena\u2010Anabar Basin in northern Siberia, in addition to new biomarker data from the Walcott Member of the Chuar Group, USA. The Siberian drill\u2010cores span the late Tonian (ca. 800\u2013750\u2009Ma) and late Ediacaran\u2010early Cambrian periods (ca. 565\u2013539\u2009Ma), with Cryogenian strata absent. Compositional differences in sedimentary organic matter were assessed using a suite of biomarker hydrocarbon parameters, with seawater redox and phosphorus availability determined using iron speciation, trace metals, and phosphorus phase partitioning. Steranes were consistently detected in Tonian strata in the Siberian drill\u2010cores, with sterane\/hopane (S\/H) values being uniformly low (&lt;\u20090.05), consistent with a low\u2010productivity, marine environment in which bacteria outcompeted eukaryotes for limited nutrients. This was confirmed by phosphorus phase partitioning data that suggest that phosphorus was a key limiter of late Tonian marine eukaryote abundance. Unlike Siberia, late Tonian samples from the Chuar Group showed consistently higher S\/H values (up to 0.38) and elevated total organic carbon content (1.3\u20135.6\u2009wt.%) indicative of higher algal productivity in a eutrophic marine setting. Tonian strata primarily yielded cholestane (C\n                    <jats:sub>27<\/jats:sub>\n                    sterane), indicating red algal dominance with small contributions of cryostane and ergostane (C\n                    <jats:sub>28<\/jats:sub>\n                    steranes), while Ediacaran strata in both Siberian drill\u2010cores were dominated by stigmastane (C\n                    <jats:sub>29<\/jats:sub>\n                    sterane), indicating green algal dominance, capturing this global secular shift in a single location. The distinctive C\n                    <jats:sub>27<\/jats:sub>\n                    \u2010sterane dominance commonly found for the late Tonian is captured here for the first time from an oligotrophic marine environment that sustained oxic to weakly reducing redox conditions, supporting the idea that the Tonian rise of algae occurred widely across the oceans.\n                  <\/jats:p>","DOI":"10.1111\/gbi.70061","type":"journal-article","created":{"date-parts":[[2026,9,7]],"date-time":"2026-09-07T05:04:25Z","timestamp":1788757465000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Red to Green: A Lipid Biomarker Record of Tonian\u2010Ediacaran Algae in Siberia"],"prefix":"10.1111","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1664-2756","authenticated-orcid":false,"given":"Adriana I.","family":"Rizzo","sequence":"first","affiliation":[{"name":"Department of Earth and Planetary Sciences University of California  Riverside California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1154-0585","authenticated-orcid":false,"given":"Andrey","family":"Bekker","sequence":"additional","affiliation":[{"name":"Department of Earth and Planetary Sciences University of California  Riverside California USA"},{"name":"Department of Geology University of Johannesburg  Johannesburg South Africa"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anton B.","family":"Kuznetsov","sequence":"additional","affiliation":[{"name":"Institute of Precambrian Geology and Geochronology (IPGG) Russian Academy of Sciences  Saint Petersburg Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9661-1708","authenticated-orcid":false,"given":"Victoria B.","family":"Ershova","sequence":"additional","affiliation":[{"name":"Institute of Earth Science St. Petersburg State University  St. Petersburg Russia"},{"name":"Geological Institute Russian Academy of Sciences  Moscow Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yijun","family":"Xiong","sequence":"additional","affiliation":[{"name":"School of Earth and Environment University of Leeds  Leeds UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2756-1724","authenticated-orcid":false,"given":"Karl E.","family":"Karlstrom","sequence":"additional","affiliation":[{"name":"Department of Earth and Planetary Science University of New Mexico  Albuquerque New Mexico USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7621-189X","authenticated-orcid":false,"given":"Simon W.","family":"Poulton","sequence":"additional","affiliation":[{"name":"School of Earth and Environment University of Leeds  Leeds UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6516-014X","authenticated-orcid":false,"given":"Gordon D.","family":"Love","sequence":"additional","affiliation":[{"name":"Department of Earth and Planetary Sciences University of California  Riverside California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,6]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.orggeochem.2017.11.006"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/ggr.12342"},{"key":"e_1_2_11_4_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41561\u2010022\u201000906\u20105"},{"key":"e_1_2_11_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.earscirev.2020.103175"},{"key":"e_1_2_11_6_1","doi-asserted-by":"crossref","first-page":"455","DOI":"10.1007\/978-1-4899-0762-2_24","volume-title":"Primary Productivity and Biogeochemical Cycles in the Sea","author":"Berger W. 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