Fossil localities of the Santa Cruz Formation (Early Miocene,Patagonia, Argentina) prospected by Carlos Ameghino in 1887 revisited and the location of the Notohippidian |
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| Institution: | 1. Sección Paleontología de Vertebrados, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Av. Ángel Gallardo 470, 1405DJR Ciudad Autónoma de Buenos Aires, Argentina;2. Departamento de Ciencias Básicas, Universidad Nacional de Luján Ruta 5 y Avenida Constitución, 6700 Luján, Buenos Aires, Argentina;3. Universidad de Buenos Aires, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Intendente Guiraldes 2160, C1428EHA Ciudad Autónoma de Buenos Aires, Argentina;4. División Paleontología Vertebrados, Museo de La Plata, Paseo del Bosque s/n, B1900FWA La Plata, Argentina;5. CONICET, Argentina;6. CIC, Argentina;7. Department of Evolutionary Anthropology, Box 90383, Duke University, Durham, NC 27708, USA;1. Instituto Superior de Correlación Geológica (INSUGEO-CONICET), Universidad Nacional de Tucumán, Miguel Lillo 205, T4000JFE, San Miguel de Tucumán, Argentina;2. Facultad de Ciencias Naturales e Instituto Miguel Lillo, Universidad Nacional de Tucumán, Miguel Lillo 205, T4000JFE, San Miguel de Tucumán, Argentina;3. Paleontología, Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA), Centro Científico Tecnológico CONICET Mendoza, Avda. Ruiz Leal s/n, 5500, Mendoza, Argentina;1. Universidad de Buenos Aires, CONICET, Instituto de Estudios Andinos Don Pablo Groeber (IDEAN), Departamento de Geología, Facultad de Ciencias Exactas y Naturales, Ricardo Güiraldes 2160, C1428EGA Buenos Aires, Argentina;2. Paleontología, Instituto de Nivología, Glaciología y Ciencias Ambientales; Centro Científico Tecnológico-CONICET-Mendoza, Avda. Ruiz Leal s/n, 5500 Mendoza, Argentina;3. Amherst College, Beneski Museum of Natural History, 220 South Pleasant Street, 01002 Amherst, MA, USA;1. Instituto Patagónico de Geología y Paleontología, Centro Nacional Patagónico (IPGP, CCT CONICET-CENPAT), Boulevard Brown 2915, U9120ACD, Puerto Madryn, Chubut, Argentina;2. Museo Paleontológico Egidio Feruglio (MEF), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Fontana 140, U9100GYO, Trelew, Chubut, Argentina;1. Museo Argentino de Ciencias Naturales B. Rivadavia, A. Gallardo 470, C1405DJR Buenos Aires, Argentina;2. Facultad de Ciencias, Departamento de Evolución de Cuencas, Universidad de la República, Iguá 4225, 11400 Montevideo, Uruguay;3. Earth Sciences, University College London, Gower Street, London WC1E 6BT, United Kingdom;4. Museo de La Plata, 1900 La Plata, Argentina;1. Programa de Pós-Graduação em Geociências, Universidade Federal do Rio Grande do Sul (PPGGEO UFRGS), Avenida Bento Gonçalves, 9500, 91501-970, Porto Alegre, Brazil;2. Laboratoire de Paléontologie, Institut des Sciences de l’Évolution de Montpellier (ISEM, UMR 5554, UM/CNRS/IRD/EPHE), Université de Montpellier, Place Eugène Bataillon, 34095, Montpellier, France;3. Unidades de Investigación Anexo Museo, Facultad de Ciencias Naturales y Museo (UNLP), Avenida 60 y 122, B1900FWA, La Plata, Argentina;4. Instituto de Ecorregiones Andinas (INECOA), Universidad Nacional de Jujuy, CONICET, IdGyM, Avenida Bolivia 1661, 4600, San Salvador de Jujuy, Argentina;5. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA), CCT–CONICET–Mendoza, Avenida Ruiz Leal s/n, Parque Gral, San Martín, 5500, Mendoza, Argentina;6. Paläontologisches Institut und Museum, Universität Zürich, Karl-Schmid-Strasse 4, 8006, Zürich, Switzerland;7. Departamento de Paleontología de Vertebrados, Museo de Historia Natural - Universidad Nacional Mayor San Marcos (UNMSM, DPV-MUSM), Avenida Arenales, 1256, Lima 14, Peru;8. BioGeoCiencias Lab, Facultad de Ciencias y Filosofía/CIDIS, Laboratorios de Investigacion y Desarrollo (LID), Centro de Investigación para el Desarrollo Integral y Sostenible (CIDIS), Universidad Peruana Cayetano Heredia, Avenida Honorio Delgado 430, Lima 31, Peru;9. Department of Archaeology, University of Cambridge, Downing Street, CB2 3DZ, Cambridge, UK;10. Instituto de Ciências Exatas, Departamento de Geociências, Universidade Federal do Amazonas (UFAM), Avenida General Rodrigo Octavio Jordão Ramos, 1200, Coroado I, 69067-005, Manaus, Brazil;11. Laboratório de Geocronologia, Instituto de Geociências, Universidade de Brasília (UnB), Campus Universitário Darcy Ribeiro ICC, Ala Central, 70910-000, Brasília, Brazil;12. Géosciences-Environnement Toulouse, Université de Toulouse (UPS (SVT-OMP)/CNRS/IRD), 14 Avenue Édouard Belin, F-31400, Toulouse, France;13. Seção de Paleontologia, Museu de Ciências Naturais, Secretaria do Meio Ambiente e Infraestrutura, Avenida Dr. Salvador França 1427, 90690-000, Porto Alegre, Brazil |
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| Abstract: | Between January and September of 1887 Carlos Ameghino carried out his first geologic and paleontological expedition to the Río Santa Cruz, Patagonia. Based on the fossils and geologic information compiled, in 1887 and 1889, Florentino Ameghino named more than 120 new species of extinct mammals and his Formación Santacruceña and Piso Santacruceño (Santacrucian stage). Data published by both brothers state that the specimens were collected in outcrops by the Río Santa Cruz, between 90 and 200 km west of its mouth. However, information in the posthumously published letters and Travel Diary of C. Ameghino allows us to recognize a fourth locality, Río Bote, at about 50 km further southwest. In 1900, 1902, F. Ameghino divided the Piso Santacruceño in a younger étage Santacruzienne and older étage Notohippidéen, restricting the geographical distribution of the latter to Kar Aiken locality, northeast of Lago Argentino. However, 15 of the 54 species that F. Ameghino listed as exclusively Notohippidian stage already had been named on specimens collected South to the Río Santa Cruz in 1887, two year prior to C. Ameghino's first visit to Kar Aiken. Based on historical information and several expeditions to the Río Santa Cruz and its environs, in this contribution we establish the geographical locations of the 1887 localities, formalize their names, evaluate the stratigraphic position of the fossil-bearing levels, and analyze the geographic extension of the Notohippidian, inferring that Río Bote is where C. Ameghino first collected species that came to define the Notohippidian. |
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| Keywords: | Carlos Ameghino Río Santa Cruz Fossil mammals Santacrucian Notohippidian |
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