<?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>1405-3322</journal-id>
<journal-title><![CDATA[Boletín de la Sociedad Geológica Mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Soc. Geol. Mex]]></abbrev-journal-title>
<issn>1405-3322</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Geológica Mexicana A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-33222022000300008</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2022v74n3a200622</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Late Pleistocene paleoenvironment at a Middle Stone Age archaeological site in Equatorial Guinea: a paleopedological approach]]></article-title>
<article-title xml:lang="es"><![CDATA[Paleoambiente pleistocénico tardío en un sitio arqueológico del Mesolítico de Guinea Ecuatorial: un enfoque paleopedológico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-y-Cruz]]></surname>
<given-names><![CDATA[Tamara]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Terrazas-Mata]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pogosyan]]></surname>
<given-names><![CDATA[Lilit]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sedov]]></surname>
<given-names><![CDATA[Sergey]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pi-Puig]]></surname>
<given-names><![CDATA[Teresa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera-González]]></surname>
<given-names><![CDATA[Iran]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Menéndez-Iglesias]]></surname>
<given-names><![CDATA[Beatriz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Rivas]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cabadas-Báez]]></surname>
<given-names><![CDATA[Héctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México  ]]></institution>
<addr-line><![CDATA[ CDMX]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Antropología e Historia Escuela Nacional de Antropología e Historia ]]></institution>
<addr-line><![CDATA[ CDMX]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Institute of Anthropological Research ]]></institution>
<addr-line><![CDATA[ CDMX]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Moscow State University Faculty of Soil Science ]]></institution>
<addr-line><![CDATA[Moscow ]]></addr-line>
<country>Russia</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Nacional Autónoma de México Institute of Geology ]]></institution>
<addr-line><![CDATA[ CDMX]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidad Nacional Autónoma de México Institute of Geology National Laboratory of Geochemistry and Mineralogy]]></institution>
<addr-line><![CDATA[ CDMX]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,Gerda Henkel Foundation  ]]></institution>
<addr-line><![CDATA[Düsseldorf ]]></addr-line>
<country>Germany</country>
</aff>
<aff id="Af8">
<institution><![CDATA[,Universidad Nacional Autónoma de México  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af9">
<institution><![CDATA[,Universidad Autónoma del Estado de México Faculty of Geography ]]></institution>
<addr-line><![CDATA[Toluca Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<volume>74</volume>
<numero>3</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222022000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222022000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222022000300008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Key evidence of human occupation in Africa during the Middle Palaeolithic (Middle Stone Age [MSA]) is available from the south and east of the continent, where semi-arid climate prevails. Rare evidence of MSA human occupation in the humid tropical region was recently reported from Equatorial Guinea. To identify if paleolithic human occupation occurred in the tropical forest, the stratigraphy of the recently discovered archaeological site &#8220;Mabewele I&#8221; was analyzed using a paleopedological approach. The properties evaluated along a vertical profile are: granulometry, magnetic susceptibility (K), free iron extractable with sodium dithionite (Fed), total organic carbon (TOC), chemical composition by X-ray fluorescence (XRF), X-ray diffraction mineralogy (XRD), ternary plot of the three main oxides (SiO2-Al2O3-Fe2O3), phytoliths and micromorphology. The predominant fraction is sand, with a significant clay content (&gt; 30 %). The K and the Fed presented low values, as well as the TOC. XRF showed few variations along the sequence and XRD showed that the clays are mainly kaolinites, with a very low component of vermiculites. The phytoliths correspond to tropical vegetation with few changes in the vegetal composition between the deep and superficial zones. A charcoal from the lower part of the profile was dated between 12.57-12.24 ka cal BP, while the main artifact horizon was located at the bottom. The analytical results appear contradictory: on the one hand, there is evidence of intense chemical weathering under a humid tropical climate, but the clay cutans in the pores are very scarce and incipient and the iron nodules are mostly anorthic. This indicates that the sequence is composed of pedosediments associated with a high environmental dynamism, with short periods of erosion-sedimentation-pedogenesis. The results allow us to propose that humans inhabited the tropical forest during the MSA and that erosion-sedimentation processes could be related to anthropization processes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Las principales evidencias de ocupación humana en África durante la Edad de la Piedra Media (Middle Stone Age -MSA-) se han hallado en el sur y el este del continente, en las regiones de climas secos. Sin embargo, investigaciones recientes en la región tropical de Guinea Ecuatorial han hallado artefactos arqueológicos de dicho periodo. Para identificar si la ocupación humana paleolítica ocurrió en la selva tropical, se analizó la estratigrafía del sitio arqueológico &#8220;Mabewele I&#8221;, recientemente descubierto, bajo un enfoque paleopedológico. Las propiedades evaluadas fueron: granulometría, susceptibilidad magnética, hierro libre extractable con ditionito de sodio (Fed), carbono orgánico total (TOC), composición química por Fluorescencia de rayos X (FRX), mineralogía por difracción de rayos X (DRX), fitolitos y micromorfología. La fracción predominante es la arena, con un contenido de arcillas importante. La K y el Fed presentaron valores bajos, al igual que el TOC. La FRX mostró pocas variaciones a lo largo de la secuencia y la DRX indicó que las arcillas son principalmente caolinitas, con un componente muy bajo de vermiculitas. Los fitolitos corresponden a vegetación tropical, con pocos cambios en la composición vegetal entre las zonas profunda y superficial. Un carbón de la parte baja del perfil fue datado entre 12.57-12.24 ka Cal AP, mientras que los artefactos fueron localizados al fondo. Los resultados analíticos son contradictorios: por un lado, hay evidencias de intemperismo químico intenso bajo un clima tropical húmedo, pero los cutanes de arcilla en los poros son muy escasos e incipientes y los nódulos de hierro son mayormente anórticos. Ello indica que la secuencia se compone de pedosedimentos asociados a un alto dinamismo ambiental, con cortos periodos de erosión-sedimentación-pedogénesis. Los resultados permiten proponer que los humanos habitaron la selva tropical durante el MSA y que los procesos de erosión-sedimentación podrían estar relacionados con procesos de antropización.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Middle Stone Age]]></kwd>
<kwd lng="en"><![CDATA[Equatorial Guinea]]></kwd>
<kwd lng="en"><![CDATA[rainforest]]></kwd>
<kwd lng="en"><![CDATA[paleopedology]]></kwd>
<kwd lng="es"><![CDATA[Edad de Piedra Media]]></kwd>
<kwd lng="es"><![CDATA[Guinea Ecuatorial]]></kwd>
<kwd lng="es"><![CDATA[selva tropical]]></kwd>
<kwd lng="es"><![CDATA[paleopedología]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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