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Locating warming events is critical for understanding how terrestrial animals and plants responded to past climate change. We recognize two carbon isotope excursions (CIEs) in lower Paleocene (Danian) strata of the San Juan Basin, New Mexico, United States, based on sustained decreases in carbon isotope values in bulk organic carbon. The upper excursion correlates closely with the Latest Danian Event (LDE) hyperthermal, previously known with confidence only from the marine record. We correlate the lower excursion to a smaller CIE in the marine record tied to a 405,000-year eccentricity cycle, and modest warming. Both excursions in the San Juan Basin occur in red bed intervals bounded by drab-colored rocks, suggesting transient seasonal drying. Both are also associated with marked decreases in percent total organic carbon, possibly representing decreased primary productivity. The lower excursion is associated with a strong pulse of mammalian faunal turnover. Strata above the LDE are unfossiliferous, precluding local turnover analysis, but a strong, regional pulse of turnover occurs at or near the LDE. Our results suggest warming and\/or drying during these events resulted in ecological perturbations, accelerating mammalian origination and extinction rates. Additionally, the first representatives of two North American mammalian families (Arctocyonidae, Plesiadapidae) reached Europe around the time of the LDE. We hypothesize that this was in response to short-term warming, which opened a previously impassable high-latitude dispersal route connecting the continents.<\/jats:p>","DOI":"10.1093\/pnasnexus\/pgag289","type":"journal-article","created":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T07:40:01Z","timestamp":1787816401000},"source":"Crossref","is-referenced-by-count":0,"title":["Recognition of two potential warming events in the Paleocene terrestrial record of North America and associated mammalian responses"],"prefix":"10.1093","volume":"5","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4400-9608","authenticated-orcid":false,"given":"Ross","family":"Secord","sequence":"first","affiliation":[{"name":"Department of Earth and Atmospheric Sciences, University of Nebraska\u2013Lincoln , Lincoln, NE 68588 ,","place":["USA"]},{"name":"Division of Vertebrate Paleontology, University of Nebraska State Museum , Lincoln, NE 68588 ,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4263-133X","authenticated-orcid":false,"given":"Daniel J","family":"Peppe","sequence":"additional","affiliation":[{"name":"School of Earth and Environmental Sciences, Baylor University , Waco, TX 76706 ,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2856-9632","authenticated-orcid":false,"given":"Thomas E","family":"Williamson","sequence":"additional","affiliation":[{"name":"New Mexico Museum of Natural History and Science , Albuquerque, NM 87104 ,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Caitlin E","family":"Leslie","sequence":"additional","affiliation":[{"name":"School of Earth and Environmental Sciences, Baylor University , Waco, TX 76706 ,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7525-7319","authenticated-orcid":false,"given":"Stephen L","family":"Brusatte","sequence":"additional","affiliation":[{"name":"School of GeoSciences, Grant Institute, University of Edinburgh , Edinburgh EH9 3FE ,","place":["United Kingdom"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1371-1878","authenticated-orcid":false,"given":"Andrew G","family":"Flynn","sequence":"additional","affiliation":[{"name":"School of Earth and Environmental Sciences, Baylor University , Waco, TX 76706 ,","place":["USA"]},{"name":"Department of Geological Sciences, New Mexico State University , Las Cruces, NM 88003 ,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2026,8,27]]},"reference":[{"key":"2026091009063207900_pgag289-B1","doi-asserted-by":"crossref","first-page":"1151","DOI":"10.5194\/cp-12-1151-2016","article-title":"Environmental impact and magnitude of paleosol carbonate carbon isotope excursions marking five early Eocene hyperthermals in the Bighorn Basin, Wyoming","volume":"12","author":"Abels","year":"2016","journal-title":"Clim Past"},{"key":"2026091009063207900_pgag289-B2","doi-asserted-by":"crossref","first-page":"672","DOI":"10.1029\/2019PA003556","article-title":"A high-fidelity benthic stable isotope record of Late Cretaceous\u2013early Eocene climate change and carbon-cycling","volume":"34","author":"Barnet","year":"2019","journal-title":"Paleoceanogr Paleoclimatol"},{"key":"2026091009063207900_pgag289-B3","doi-asserted-by":"crossref","first-page":"775","DOI":"10.1038\/ngeo1266","article-title":"A model 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