{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T01:06:57Z","timestamp":1788916017101,"version":"build-2803163510"},"reference-count":53,"publisher":"The Royal Society","issue":"9","license":[{"start":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T00:00:00Z","timestamp":1788912000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["22K03800"],"award-info":[{"award-number":["22K03800"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100000038","name":"NSERC","doi-asserted-by":"publisher","award":["RGPIN 04697"],"award-info":[{"award-number":["RGPIN 04697"]}],"id":[{"id":"10.13039\/501100000038","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,9,9]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Dinosaur egg remains are rarely found in areas of high palaeolatitudes, with Canada (approx. 57\u201360\u00b0 N) and Siberia (approx. 70\u201375\u00b0 N) yielding the most polarward occurrences. Here, we describe dinosaur eggshells from the Upper Cretaceous (Maastrichtian) Chorrillo Formation of southernmost Patagonia (Argentina), an area located at approximately 55\u201360\u00b0 S palaeolatitude during that time interval. The more than 250 eggshell fragments collected are assignable to Fusioolithus oosp., an ootaxon known from Late Cretaceous Gondwana regions that probably belongs to titanosaur dinosaurs. The eggshells are shown to have a high porosity like those of titanosaur eggs studied previously, indicating the eggs were fully covered by nest substrate during incubation. The high latitude of the area in the Maastrichtian suggests the eggs were buried in a mound-style nest where microbial decay, rather than solar radiation, was the primary source of incubation heat. The Chorrillo Formation represents, to our knowledge, the highest palaeolatitude area to produce definitive dinosaur egg remains from the Southern Hemisphere and reveals that titanosaurs were nesting at higher latitudes than previously known.<\/jats:p>","DOI":"10.1098\/rsos.260333","type":"journal-article","created":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T00:12:34Z","timestamp":1788912754000},"source":"Crossref","is-referenced-by-count":0,"title":["Titanosaur eggshells from the latest Cretaceous of Patagonia, Argentina: implications for nesting at high latitude"],"prefix":"10.1098","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4721-6418","authenticated-orcid":false,"given":"Kohei","family":"Tanaka","sequence":"first","affiliation":[{"name":"Institute of Life and Environmental Sciences, University of Tsukuba 1 , Tsukuba, Ibaraki Prefecture, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fernando E.","family":"Novas","sequence":"additional","affiliation":[{"name":"CONICET- Fundaci\u00f3n de Historia Natural F\u00e9lix de Azara 2 , Buenos Aires, Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Makoto","family":"Manabe","sequence":"additional","affiliation":[{"name":"National Museum of Nature and Science 3 , Tsukuba, Ibaraki Prefecture, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chisako","family":"Sakata","sequence":"additional","affiliation":[{"name":"National Museum of Nature and Science 3 , Tsukuba, Ibaraki Prefecture, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jordi Alexis","family":"Garcia Mars\u00e0","sequence":"additional","affiliation":[{"name":"Laboratorio de Anatom\u00eda comparada y Evoluci\u00f3n de los Vertebrados, Museo Argentino de Ciencias Naturales \"Bernardino Rivadavia\" 4 , Capital Federal, Buenos Aires, Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2627-1226","authenticated-orcid":false,"given":"Darla K.","family":"Zelenitsky","sequence":"additional","affiliation":[{"name":"Department of Earth, Energy and Environment, University of Calgary 5 , Calgary, Alberta, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"175","published-online":{"date-parts":[[2026,9,9]]},"reference":[{"key":"2026090820122462800_rsos260333C1","doi-asserted-by":"crossref","first-page":"317","DOI":"10.1016\/j.palaeo.2015.09.041","article-title":"Environmental constraints on terrestrial vertebrate behaviour and reproduction in the high Arctic of the Late Cretaceous","volume":"441","author":"Herman","year":"2016","journal-title":"Palaeogeogr. 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