<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0370-3908</journal-id>
<journal-title><![CDATA[Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. acad. colomb. cienc. exact. fis. nat.]]></abbrev-journal-title>
<issn>0370-3908</issn>
<publisher>
<publisher-name><![CDATA[Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0370-39082023000400925</article-id>
<article-id pub-id-type="doi">10.18257/raccefyn.1921</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Eocene to Miocene palynology of the Amagá Basin (Cauca Valley, Colombia) compared to the Caribbean Region]]></article-title>
<article-title xml:lang="es"><![CDATA[Palinología del Eoceno al Mioceno de la cuenca de Amagá (Valle del Cauca, Colombia) comparada con la Región Caribe]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pardo-Trujillo]]></surname>
<given-names><![CDATA[Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Plata-Torres]]></surname>
<given-names><![CDATA[Angelo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramirez]]></surname>
<given-names><![CDATA[Edwin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vallejo-Hincapié]]></surname>
<given-names><![CDATA[Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Trejos-Tamayo]]></surname>
<given-names><![CDATA[Raúl]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Caldas Departamento de Ciencias Geológicas ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Caldas Instituto de Investigaciones en Estratigrafía (IIES) Grupo de Investigaciones en Estratigrafía y Vulcanología (GIEV-Cumanday]]></institution>
<addr-line><![CDATA[Manizales ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Salamanca Departamento de Geología ]]></institution>
<addr-line><![CDATA[Salmanca ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,CCT-CONICET Mendoza Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA) ]]></institution>
<addr-line><![CDATA[Mendoza ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<volume>47</volume>
<numero>185</numero>
<fpage>925</fpage>
<lpage>942</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0370-39082023000400925&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0370-39082023000400925&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0370-39082023000400925&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Citation: Pardo-Trujillo A, Plata-Torres A, Ramírez E, et al. Eocene to Miocene palynology of the Amagá Basin (Cauca Valley, Colombia) compared to the Caribbean Region. Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales. 47(185):925-942, octubre-diciembre de 2023. doi: https://doi.org/10.18257/raccefyn.1921 The Cenozoic sedimentary basins of northwestern Colombia contain clues to understanding the evolution of past ecosystems and their possible relationship to regional events, such as the uplift of the northern Andes and the collision of the Panama-Chocó Block with the South American continent. However, these basins have not been thoroughly investigated. This work aims to fill this knowledge gap by performing a comprehensive palynological analysis of the Amagá Basin (Valle del Cauca). Three outcrops were studied to determine their depositional ages, paleoenvironments, and overall floral composition over time. To contextualize our analyses, a comparison was made with two drill holes (ANH-SSJ-Nueva Esperanza-1X and ANH-San Jacinto-1) in the Sinú-San Jacinto Basin in the Colombian Caribbean. The application of the palynological zonation from the Llanos Basin in eastern Colombia was also used to evaluate its suitability in the Amagá Basin. The age of deposition was determined by using several traditional palynostratigraphic markers, including Perisyncolporites pokornyi, Foveotriporites hammeni, Retibrevitricolporites speciosus, Magnastriatites grandiosus, Concavissimisporites fossulatus, Clavainaperturites microclavatus, and Polypodiaceoisporites pseudopsilatus. This assemblage indicates a Middle to Late Eocene, Oligocene, and Miocene age spanning from ~40 to 18 Ma (~22 Myr). However, there are also some differences with respect to the Llanos zonation, such as the absence of Cicatricosisporites dorogensis. Based on this age model, we question whether it is correct to include all these deposits in a single lithostratigraphic unit under the rank of a formation. In the Caribbean, stratigraphic units of similar age exhibit a greater number of key taxa than in the Llanos zonation. In addition, the presence of calcareous microfossils allows for a more detailed determination of the sedimentation age. Furthermore, the discovery of new pollen and spore species could improve the resolution of the biostratigraphy in western Colombia. In the Amagá Basin, only terrestrial palynomorphs were found, which, together with the sedimentary facies, suggest a humid lowland tropical vegetation in fluvial and lacustrine environments.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las cuencas sedimentarias cenozoicas del noroeste de Colombia contienen pistas para comprender la evolución de los ecosistemas del pasado y su posible relación con acontecimientos regionales tales como el levantamiento de los Andes septentrionales y la colisión del bloque Panamá-Chocó con el continente suramericano. Sin embargo, estas cuencas no se han investigado a fondo. Este trabajo pretende llenar este vacío de conocimiento realizando un análisis palinológico exhaustivo de la cuenca de Amagá (Valle del Cauca). Se estudiaron tres afloramientos para determinar sus edades de depósito, paleoambientes y composición florística general a lo largo del tiempo. Además, se comparó con dos sondeos (ANH-SSJ-Nueva Esperanza-1X y ANH-San Jacinto-1) perforados en la cuenca del Sinú-San Jacinto en el Caribe colombiano y se utilizó la zonación palinológica de la cuenca de los Llanos en el oriente colombiano para evaluar su aplicación en la cuenca de Amagá. La edad de depositación fue determinada usando varios marcadores palinoestratigráficos tradicionales, entre ellos Perisyncolporites pokornyi, Foveotriporites hammeni, Retibrevitricolporites speciosus, Magnastriatites grandiosus, Concavissimisporites fossulatus, Clavainaperturites microclavatus, y Polypodiaceoisporites pseudopsilatus. Esta asociación indica una edad comprendida entre el Eoceno Medio a Tardío, el Oligoceno y el Mioceno, abarcando de ~40 a 18 Ma (~22 Myr). Sin embargo, también existen algunas diferencias con respecto a la zonación de los Llanos, como la ausencia de Cicatricosisporites dorogensis. Con base en este modelo de edad, cuestionamos si es correcto incluir todos estos depósitos en una única unidad litoestratigráfica bajo el rango de formación. En el Caribe, las unidades estratigráficas de edad similar exhiben un mayor número de taxones clave de la zonación de los Llanos. Además, la presencia de microfósiles calcáreos permite una determinación más detallada de la edad de sedimentación. Por otra parte, el descubrimiento de nuevas especies de polen y esporas podría mejorar la resolución de la bioestratigrafía en el oeste de Colombia. En la cuenca del Amagá, sólo se hallaron palinomorfos terrestres, los cuales, junto con las facies sedimentarias, sugieren una vegetación tropical húmeda de tierras bajas en ambientes fluviales y lacustres.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Palynology]]></kwd>
<kwd lng="en"><![CDATA[Palynostratigraphy]]></kwd>
<kwd lng="en"><![CDATA[Amagá Basin]]></kwd>
<kwd lng="en"><![CDATA[Caribbean, Eocene]]></kwd>
<kwd lng="en"><![CDATA[Oligocene]]></kwd>
<kwd lng="en"><![CDATA[Miocene]]></kwd>
<kwd lng="es"><![CDATA[Palinología]]></kwd>
<kwd lng="es"><![CDATA[Palinosestratigrafía]]></kwd>
<kwd lng="es"><![CDATA[Cuenca de Amagá]]></kwd>
<kwd lng="es"><![CDATA[Caribe colombiano]]></kwd>
<kwd lng="es"><![CDATA[Eoceno]]></kwd>
<kwd lng="es"><![CDATA[Oligoceno]]></kwd>
<kwd lng="es"><![CDATA[Mioceno]]></kwd>
</kwd-group>
</article-meta>
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