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      First bird remains from the Eocene of Algarrobo, central Chile Translated title: Primeros restos de aves del Eoceno de Algarrobo, Chile central

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          Abstract

          Paleogene records of birds in the Eastern margin of the Pacific Ocean have increased in recent years, being almost exclusively restricted to fossil Sphenisciformes (penguins). New avian remains (Ornithurae, Neornithes) from Middle-to-Late Eocene levels of the Estratos de Algarrobo unit, in Algarrobo, central Chile, are disclosed in the present work. These new finds are significant in representing the first non-spheniscid bird remains of Middle to Late Eocene age, recovered in mid-latitudes of the eastern Pacific and probably belonging to a procelarid. It complements the regional record of Eocene birds, previously known only at high-latitudes such as Seymour Island (Antarctica) and Magallanes (Chile), and low-latitude locations in Peru.

          Translated abstract

          Los registros de aves paleógenas en el margen oriental del Océano Pacífico se han incrementado en los últimos años, estando casi exclusivamente restringidos a Sphenisciformes fósiles (pingüinos). Nuevos fósiles avianos (Ornithurae, Neornithes) provenientes de niveles del Eoceno Medio a Tardío de los Estratos de Algarrobo, en Algarrobo, Chile central, son dados a conocer en el presente trabajo. Estos nuevos hallazgos son significativos en representar los primeros restos de aves no-spheníscidos de edad Eoceno Medio a Tardío, recuperadas en latitudes intermedias del Pacífico oriental y probablemente pertenezcan a un procelárido. Este hallazgo complementa el registro regional del grupo durante el Eoceno, anteriormente conocido en localidades de altas latitudes como isla Seymour (Antártica) y Magallanes (Chile), y localidades de bajas latitudes en Perú.

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          Timing and climatic consequences of the opening of Drake Passage.

          Age estimates for the opening of Drake Passage range from 49 to 17 million years ago (Ma), complicating interpretations of the relationship between ocean circulation and global cooling. Secular variations of neodymium isotope ratios at Agulhas Ridge (Southern Ocean, Atlantic sector) suggest an influx of shallow Pacific seawater approximately 41 Ma. The timing of this connection and the subsequent deepening of the passage coincide with increased biological productivity and abrupt climate reversals. Circulation/productivity linkages are proposed as a mechanism for declining atmospheric carbon dioxide. These results also indicate that Drake Passage opened before the Tasmanian Gateway, implying the late Eocene establishment of a complete circum-Antarctic pathway.
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            Evolution of Cenozoic seaways in the circum-Antarctic region

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              The evolution of femoral osteology and soft tissues on the line to extant birds (Neornithes)

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                andgeol
                Andean geology
                AndGeo
                Servicio Nacional de Geología y Minería (SERNAGEOMIN) (Santiago )
                0718-7106
                September 2012
                : 39
                : 3
                : 548-557
                Affiliations
                [1 ] Universidad de Chile Chile
                [2 ] Laboratorio de Zoología de Vertebrados
                [3 ] Universidad de Chile Chile
                [4 ] MUSEO PALEONTOLOGICO CALDERA Chile
                Article
                S0718-71062012000300010
                10.5027/andgeoV39n3-a010
                0532c452-a1e3-4796-b339-ac1b8f7a6d37

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Chile

                Self URI (journal page): http://www.scielo.cl/scielo.php?script=sci_serial&pid=0718-7106&lng=en
                Categories
                GEOLOGY
                GEOSCIENCES, MULTIDISCIPLINARY

                General geosciences,Geology & Mineralogy
                Birds,Eocene,Biogeography,Algarrobo,Chile,Aves,Eoceno,Biogeografía
                General geosciences, Geology & Mineralogy
                Birds, Eocene, Biogeography, Algarrobo, Chile, Aves, Eoceno, Biogeografía

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