<?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>2007-4298</journal-id>
<journal-title><![CDATA[Botanical Sciences]]></journal-title>
<abbrev-journal-title><![CDATA[Bot. sci]]></abbrev-journal-title>
<issn>2007-4298</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Botánica de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-42982016000200269</article-id>
<article-id pub-id-type="doi">10.17129/botsci.438</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Maderas fósiles de la formación San Carlos (Cretácico Superior), Chihuahua, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Fossil woods from the San Carlos Formation (Upper Cretaceous), Chihuahua, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Hernández]]></surname>
<given-names><![CDATA[Imelda Perla]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Estrada-Ruiz]]></surname>
<given-names><![CDATA[Emilio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Cabrera]]></surname>
<given-names><![CDATA[Hugo Israel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Escuela Nacional de Ciencias Biológicas-Instituto Politécnico Nacional Departamento de Zoología Laboratorio de Ecología]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología Estación Regional del Noroeste]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<volume>94</volume>
<numero>2</numero>
<fpage>269</fpage>
<lpage>280</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982016000200269&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982016000200269&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982016000200269&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En los sedimentos de la Formación San Carlos (Cretácico Superior, Conaciano-Maastrichtiano) se han recolectado un gran número de maderas fósiles que corresponden principalmente a coníferas y en menor proporción a angiospermas. De este material, se describen dos nuevos registros con base en estructuras vegetativas, el primero corresponde a una conífera que presenta caracteres del género Agathoxylon como son: anillos de crecimiento indistinguibles, punteaduras predominantemente uniseriadas y ocasionalmente alternas biseriadas, punteaduras de campo de cruzamiento de tipo (tipo oculiporo) cupresoide, de 1 a 3 por campo de cruzamiento y radios predominantemente uniseriados. El segundo morfotipo se relaciona con Paraphyllanthoxylon anasazi (cf. Lauraceae), madera que se caracteriza por presentar vasos solitarios y en múltiplos radiales cortos, placas de perforación simples, punteaduras intervasculares alternas y pequeñas, punteaduras vaso-radio con bordes reducidos y radios heterocelulares, multiseriados hasta cuatro células de ancho. Estos nuevos registros fortalecen la creciente evidencia que sugiere un estrecho vínculo florístico entre las floras del norte de México y centro-sur de EUA durante el Cretácico Superior.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In the sediments of the San Carlos Formation (Upper Cretaceous, Coniacian - Maastrichtian) there have been collected a large number of fossil woods that correspond mainly to conifers and in a smaller proportion to angiosperms. From this material, two new records based on vegetative structures are described. The first corresponds to a conifer which has characters present of the Agathoxylon genus, these features are: indistinguishable growth rings, predominantly uniseriate pits, occasionally biseriate, alternate, cross-field pits (oculipore type) of the Cupressoid type, 1-3 per cross-field. The second morphotype is related to Paraphyllanthoxylon anasazi (cf. Lauraceae), which is characterized by vessels solitary and in short radial multiples, simple perforation plates, small, alternate intervascular pits, vessel-ray parenchyma pits with reduced borders, heterocellular multiseriate rays up to four cells wide. These new records strengthen the growing evidence suggesting a close floristic link between the floras of northern Mexico and south-central USA during the Late Cretaceous.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[anatomía de maderas]]></kwd>
<kwd lng="es"><![CDATA[conífera]]></kwd>
<kwd lng="es"><![CDATA[Cretácico Superior]]></kwd>
<kwd lng="es"><![CDATA[dicotiledónea]]></kwd>
<kwd lng="es"><![CDATA[Norte de México]]></kwd>
<kwd lng="en"><![CDATA[conifer]]></kwd>
<kwd lng="en"><![CDATA[dicotyledonous]]></kwd>
<kwd lng="en"><![CDATA[North of Mexico]]></kwd>
<kwd lng="en"><![CDATA[Upper Cretaceous]]></kwd>
<kwd lng="en"><![CDATA[wood anatomy]]></kwd>
</kwd-group>
</article-meta>
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