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A Paleocene lowland macroflora from Patagonia reveals significantly greater richness than North American analogs

2007; Geological Society of America; Volume: 35; Issue: 10 Linguagem: Inglês

10.1130/g23889a.1

1943-2682

Ari Iglesias, Peter Wilf, Kirk R. Johnson, Alba B. Zamuner, N. Rubén Cúneo, Sergio D. Matheos, Brad S. Singer,

Evolution and Paleontology Studies

Research Article| October 01, 2007 A Paleocene lowland macroflora from Patagonia reveals significantly greater richness than North American analogs Ari Iglesias; Ari Iglesias 1Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, 1900, La Plata, Argentina Search for other works by this author on: GSW Google Scholar Peter Wilf; Peter Wilf 2Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802, USA Search for other works by this author on: GSW Google Scholar Kirk R. Johnson; Kirk R. Johnson 3Department of Earth Sciences, Denver Museum of Nature & Science, Denver, Colorado 80205, USA Search for other works by this author on: GSW Google Scholar Alba B. Zamuner; Alba B. Zamuner 4Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, 1900, La Plata, Argentina Search for other works by this author on: GSW Google Scholar N. Rubén Cúneo; N. Rubén Cúneo 5Museo Paleontológico Egidio Feruglio, Trelew 9100, Chubut, Argentina Search for other works by this author on: GSW Google Scholar Sergio D. Matheos; Sergio D. Matheos 6Centro de Investigaciones Geológicas, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de La Plata, 1900, La Plata, Argentina Search for other works by this author on: GSW Google Scholar Bradley S. Singer Bradley S. Singer 7Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin 53706, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Ari Iglesias 1Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, 1900, La Plata, Argentina Peter Wilf 2Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802, USA Kirk R. Johnson 3Department of Earth Sciences, Denver Museum of Nature & Science, Denver, Colorado 80205, USA Alba B. Zamuner 4Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, 1900, La Plata, Argentina N. Rubén Cúneo 5Museo Paleontológico Egidio Feruglio, Trelew 9100, Chubut, Argentina Sergio D. Matheos 6Centro de Investigaciones Geológicas, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de La Plata, 1900, La Plata, Argentina Bradley S. Singer 7Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin 53706, USA Publisher: Geological Society of America Received: 15 Mar 2007 Revision Received: 29 May 2007 Accepted: 04 Jun 2007 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 The Geological Society of America, Inc. Geology (2007) 35 (10): 947–950. https://doi.org/10.1130/G23889A.1 Article history Received: 15 Mar 2007 Revision Received: 29 May 2007 Accepted: 04 Jun 2007 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Ari Iglesias, Peter Wilf, Kirk R. Johnson, Alba B. Zamuner, N. Rubén Cúneo, Sergio D. Matheos, Bradley S. Singer; A Paleocene lowland macroflora from Patagonia reveals significantly greater richness than North American analogs. Geology 2007;; 35 (10): 947–950. doi: https://doi.org/10.1130/G23889A.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Few South American macrofloras of Paleocene age are known, and this limits our knowledge of diversity and composition between the end-Cretaceous event and the Eocene appearance of high floral diversity. We report new, unbiased collections of 2516 compression specimens from the Paleocene Salamanca Formation (ca. 61.7 Ma) from two localities in the Palacio de los Loros exposures in southern Chubut, Patagonia, Argentina. Our samples reveal considerably greater richness than was previously known from the Paleocene of Patagonia, including 36 species of angiosperm leaves as well as angiosperm fruits, flowers, and seeds; ferns; and conifer leaves, cones, and seeds. The floras, which are from siltstone and sandstone channel-fills deposited on low-relief floodplain landscapes in a humid, warm temperate climate, are climatically and paleoenvironmentally comparable to many quantitatively collected Paleocene floras from the Western Interior of North America. Adjusted for sample size, there are >50% more species at each Palacio de los Loros quarry than in any comparable U.S. Paleocene sample. These results indicate more vibrant terrestrial ecosystems in Patagonian than in North American floodplain environments ∼4 m.y. after the end-Cretaceous extinction, and they push back the time line 10 m.y. for the evolution of high floral diversity in South America. The cause of the dis parity is unknown but could involve reduced impact effects because of greater distance from the Chicxulub site, higher latest Cretaceous diversity, or faster recovery or immigration rates. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.