Malvaceous wood from the Late Pleistocene El Palmar Formation of northeastern Argentina

Ramos, R. Soledad; Brea, Mariana; Kröhling, Daniela

doi:10.1016/j.revpalbo.2017.07.004

Cited by 13 publications

(5 citation statements)

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“…En la Figura 5, se muestran las imágenes macroscópicas de la muestra donde se obtuvieron las diferentes imágenes en los diferentes tipos de cortes. Como en la mayoría de los fósiles encontrados en América del Sur (Ramos et al, 2014;Pujana et al, 2014;Benicio et al, 2016;Ramos et al, 2017) y fundamentalmente porque el fragmento de madera fosilizada analizada presentan vasos que es la característica evolutiva diferente de las coníferas (Santini et al, 2021), este ejemplar pertenece a una latifoliada sin embargo hay algunos estudios en el continente que repostan algunas coníferas principalmente de la familia botánica Araucariaceae (Kunzmann, 2007;Pujana et al, 2022) y hasta el reporte de una monocotiledónea perteneciente a la familia botánica Poaceae (Olivier et al, 2009). Estudios de madera fosilizadas en el estado de Acre en el Brasil frontera con el departamento de Madre de Dios en el Perú, encontraron especies fosilizadas en la cuenca del río Acre, pertenecientes a la familia de Calophyllaceae y Combretaceae, mostrando que es posible encontrar fósiles en la Amazonía, describiendo los fragmentos de madera sin determinar su antigüedad (Kloster et al, 2017).…”

Section: Caracterización De La Anatomía De La Maderaunclassified

“…De este punto para adelante se empiezan a estudiar en el mundo las maderas fosilizadas a nivel anatómico. Estudios de paleoxilología en América del Sur se han reportado, como por ejemplo en el registro de maderas fósiles de Leguminosae en todo el continente (Pujana et al, 2011), en Argentina (Herbst et al, 2007;Ramos et al, 2014;Pujana et al, 2014;Franco, 2014;Ramos et al, 2017), en Brasil (Capretz & Rohn, 2013;Kurzawe et al, 2013;Benicio et al, 2016;Benício et al, 2016;Kloster et al, 2017), en Chile (Pujana et al, 2022) y en Perú (DeVries et al, 2017;Woodcock et al, 2017;Martínez et al, 2020).…”

Section: Introductionunclassified

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Madera Fosilizada en la Amazonía de Madre de Dios - Perú, su anatomía y su edad a través de C14

Cahuana

Pollito

Grandez-Piña

2022

Rev. Amaz. Cienc. Básicas. Apli.

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Los fósiles de madera son un recurso importante para conocer información del pasado, sin embargo, se conoce muy poco de la madera fosilizada en la Amazonía peruana, que especies existieron y de que época son. Aquí describimos anatómicamente y por primera vez un fragmento de madera y determinamos su antigüedad mediante C14. La muestra encontrada proviene de la zona minera de San Bernardo en la región de Madre de Dios en Perú. Los resultados muestran que el fragmento de madera fosilizada pertenece a una especie latifoliada, con presencia de porosidad difusa, textura media y parénquima aliforme. Sobre la determinación de la antigüedad del fragmento, lamentablemente los análisis mostraron que el carbono el fragmento ha sido completamente reemplazado, razón por la cual no se pudo determinar su antigüedad mediante C14. Finalmente destacamos la importancia de realizar esta clase de estudios en la Amazonía peruana.

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Section: Caracterización De La Anatomía De La Maderaunclassified

Section: Introductionunclassified

Madera Fosilizada en la Amazonía de Madre de Dios - Perú, su anatomía y su edad a través de C14

Cahuana

Pollito

Grandez-Piña

2022

Rev. Amaz. Cienc. Básicas. Apli.

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“…This result would extend the age of the El Palmar Fm. to the penultimate interglacial, MIS 7-Middle Pleistocene- (Ramos et al, 2017a).…”

Section: Introductionmentioning

confidence: 99%

“…Phytolith analysis is a valuable tool in the palaeoenvironmental reconstruction of sedimentary sequences, regional hydrosedimentological dynamics and geological fluvial units (Patterer, 2012;Calegari et al, 2017). Palaeobotanical research in Argentina has shown important growth in the last 10 years, mainly related to fossil wood and phytoliths in Quaternary sedimentary units (Zucol et al, 2005;Brea et al, 2010;Brea and Zucol, 2011;Patterer and Brea, 2011;Patterer, 2012, Patterer et al, 2014Ramos et al, 2012Ramos et al, , 2017a. Zucol et al (2005) described the first phytolith assemblages in a sedimentary profile of the type area of the El Palmar Fm., and Ramos (2015) complemented the knowledge of its palaeoflora with a study of petrified wood remains from this area.…”

Section: Introductionmentioning

confidence: 99%

“…The evolution of the Quaternary vegetation and its paleoenvironmental interpretation of the Uruguay river basin are still only poorly documented from the herbaceous vegetation records. Main contributions are from the palaeoxylological works of Lutz (1979Lutz ( , 1980Lutz ( , 1984Lutz ( , 1986; Brea (1998Brea ( , 1999; Brea et al (2010) and Ramos et al (2012Ramos et al ( , 2017a. The first mammal fossil record of the El Palmar Fm.…”

Section: Introductionmentioning

confidence: 99%

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Phytolith analysis in Quaternary fluvial deposits (El Palmar Formation-Late Pleistocene) of the Uruguay River valley, Entre Ríos province, Argentina

Patterer

Kröhling

Zucol

2020

Journal of South American Earth Sciences

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The phytolith assemblages of the El Palmar Formation (Late Pleistocene) are presented together with general stratigraphic and sedimentological data. The El Palmar Formation represents a channel system of the Uruguay river (South America) with longitudinal sandy gravel and gravelly sand bedforms, and associated floodplain deposits. The phytolith content of the unit was analyzed along the profiles on the right bank of the river in the middle reach (eastern Entre Ríos province, Argentina). Four outcropping profiles of the El Palmar Fm. were selected for detailed analyses: Santa Ana (Federación department), La Chola quarry, El Palmar National Park and Nueva Escocia (Colón department) localities. The herbaceous palaeoflora of the El Palmar Fm. is represented by mixed environments, such as meso-megathermic grassland with the presence of palm trees in a savanna ecosystem and micro-environments with aquatic plants and bamboo grasses that characterized a stratified forest in humid environments with high water availability. The reconstructed vegetation pattern is composed of a stratified gallery forest changing to temperate savanna, extended along the upper basin of the Uruguay river and occupying the river valley in the middle reach of the basin. The data contribute to the palaeobiodiversity knowledge of Quaternary fluvial sedimentary units of South America. In addition, the results give a better understanding of the evolutionary history of some vegetal communities, and especially the present palm trees of the El Palmar National Park reserve, as part of a relict flora that has inhabited the area since, at least, the Upper Pleistocene. The geological and micro-paleobotanical records of the El Palmar Fm. lead to the inference of general warm and humid conditions during most of the deposition of the formation, probably covering part of the last major interglacial period before the present (MIS 5).

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Early Eocene infructescences from Argentine Patagonia expand the biogeography of Malvoideae

Siegert,

Gandolfo,

Wilf

2024

American J of Botany

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PremiseFossil infructescences and isolated fruits with characters of Malvoideae, a subfamily of Malvaceae (mallow family), were collected from early Eocene sediments in Chubut, Argentina. The main goals of this research are to describe and place these fossils systematically, and to explore their biogeographical implications.MethodsFossils were collected at the Laguna del Hunco site, Huitrera Formation, Chubut, Patagonia, Argentina. They were prepared, photographed, and compared with extant and fossil infructescences and fruits of various families using herbarium material and literature.ResultsThe infructescences are panicles with alternate arrangement of fruits. They bear the fruits on short pedicels that are subtended by a bract; the fruits display an infracarpelar disk and split to the base into five ovate sections interpreted as mericarps. Each mericarp is characterized by an acute apex and the presence of a longitudinal ridge. The isolated fruits show the same features as those on the infructescences. The fossils share unique features with members of the cosmopolitan family Malvaceae, subfamily Malvoideae.ConclusionsThe fossils have a unique combination of characters that does not conform to any previously described genus, justifying the erection of a new genus and species, Uiher karuen. This new taxon constitutes the first known Malvoideae reproductive fossils of the Southern Hemisphere, expanding the distribution of Malvoideae during the early Eocene.

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Malvaceous wood from the Late Pleistocene El Palmar Formation of northeastern Argentina

Cited by 13 publications

References 68 publications

Madera Fosilizada en la Amazonía de Madre de Dios - Perú, su anatomía y su edad a través de C14

Madera Fosilizada en la Amazonía de Madre de Dios - Perú, su anatomía y su edad a través de C14

Phytolith analysis in Quaternary fluvial deposits (El Palmar Formation-Late Pleistocene) of the Uruguay River valley, Entre Ríos province, Argentina

Early Eocene infructescences from Argentine Patagonia expand the biogeography of Malvoideae

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