<?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>S1405-33222019000100093</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2019v71n1a6</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Ancient Mayan use of hidden soilscapes in the Yalahau wetlands, northern Quintana Roo, Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Uso antiguo por los Mayas de paisajes edáficos ocultos en los humedales de Yalahau, norte de Quintana Roo, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Leonard]]></surname>
<given-names><![CDATA[Daniel]]></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[Solleiro-Rebolledo]]></surname>
<given-names><![CDATA[Elizabeth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fedick]]></surname>
<given-names><![CDATA[Scott L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Diaz]]></surname>
<given-names><![CDATA[Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,HDR  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>U.S.A.</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología ]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,University of California Riverside  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>71</volume>
<numero>1</numero>
<fpage>93</fpage>
<lpage>119</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222019000100093&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222019000100093&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222019000100093&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The Yalahau region of northern Quintana Roo, Mexico, contains abundant freshwater wetlands and a history of Maya occupation that spans nearly 3000 years. The highest regional population levels occurred during the Late Preclassic period, from ca. 100 BC to AD 350/450. The Maya constructed rock alignments crossing wetland swales, and these have been hypothesized as features used to trap soil and water for production of food and useful biological resources such as periphyton. Paleoenvironmental studies from a wetland in the eastern part of the region suggested that occupation of the Yalahau region, and manipulation of the wetlands, corresponded to a period when the water table was lower than in modern times, creating wetland ecosystems that were most productive for cultivation. This paper presents results that apply this model at the regional scale (in wetlands in other parts of the region). Thirty short soil cores were collected from 12 wetlands across the region. For this project, 5 cores from 4 wetlands were selected for analyses including micromorphology and radiocarbon dating. Thin sections studied under petrographic microscope were used to identify the various types of features present in the core sequences including carbonates, organic matter, shell, pyrite, gypsum, and pore space. In each core, it was possible to distinguish an upper unit dominated by biogenic-micritic carbonate and a lower unit characterized by a variety of unique soil features such as sparitic calcite crystals, pyrite, gypsum, and gleyic properties. Based on this, it is suggested that while modern soil forming processes are fairly uniform across the region and controlled by regular annual flooding (~7 months of &gt;1m deep flooding each year), in the past (Preclassic period), flooding was less regular and wetland environments were more swampy and varied. Furthermore, it is suggested that the Preclassic depressions encountered by the Maya were a prime agricultural resource that allowed the region to flourish during the Late Preclassic period. However, as flooding became more regular at the end of the Preclassic period, the region was abandoned, only to be reoccupied in the Late Postclassic when wetlands were exploited for aquatic resources rather than for agriculture.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La región de Yalahau al norte de Quintana Roo, México, contiene abundantes humedales de agua dulce y una historia de ocupación Maya que abarca casi 3000 años. Los mayores niveles de población regional ocurrieron durante el periodo Preclásico tardío, del 100 AC al 350/450 DC. Los Mayas construyeron alineamientos rocosos cruzando los pantanos, y se ha hipotetizado que estas características funcionaron para atrapar suelos y agua para la producción de alimento y para el uso de recursos biológicos como el perifiton. Los estudios paleoambientales de un humedal de la porción oriental de la región sugieren que la ocupación de la región de Yalahau y la manipulación de los humedales, corresponden con un periodo cuando el manto freático fue menor que en tiempos modernos, creando ecosistemas de humedal que eran más productivos para el cultivo. Este trabajo presenta resultados que aplican este modelo a escala regional (en humedales en otras partes de la región). Treinta pequeños núcleos de suelo fueron colectados de 12 humedales a lo largo de la región. Para este Proyecto, 5 núcleos de 4 humedales fueron seleccionados para los análisis que incluyen micromorfología y fechamiento por radiocarbono. Las láminas delgadas, estudiadas bajo el microscopio petrográfico, fueron usadas para identificar los varios tipos de características presentes en los núcleos, incluyendo carbonatos, materia orgánica, conchas, pirita, yeso y espacio poroso. En cada núcleo, distinguimos una unidad superior dominada por carbonato micrítico biogénico y una unidad inferior caracterizada por una variedad de características de suelo únicas, como cristales esparíticos de calcita, pirita, yeso y propiedades gléycas. Basado en esto, se sugiere que mientras que los procesos formadores del suelo moderno son claramente uniformes a lo largo de la región y controlados por la inundación anual regular (~7 meses de &gt;1 m de profundidad de inundación cada año), en el pasado (periodo Preclásico), la inundación era menos regular y los ambientes de humedal fueron más pantanosos y variados. Además, se sugiere que las depresiones del Preclásico encontradas por los Mayas, fueron un recurso agrícola de calidad que permitió el florecimiento de la región durante el Preclásico tardío. Sin embargo, como la inundación se volvió más regular al final del periodo Preclásico, la región fue abandonada, solo para ser re-ocupada en el Postclásico tardío, cuando los humedales fueron explotados para recursos acuáticos, más que para la agricultura.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Maya]]></kwd>
<kwd lng="en"><![CDATA[wetland agriculture]]></kwd>
<kwd lng="en"><![CDATA[micromorphology]]></kwd>
<kwd lng="en"><![CDATA[paleoenvironmental]]></kwd>
<kwd lng="en"><![CDATA[pedogenesis]]></kwd>
<kwd lng="en"><![CDATA[geoarchaeology]]></kwd>
<kwd lng="es"><![CDATA[Maya]]></kwd>
<kwd lng="es"><![CDATA[Agricultura de humedal]]></kwd>
<kwd lng="es"><![CDATA[micromorfología]]></kwd>
<kwd lng="es"><![CDATA[cambio paleoambiental]]></kwd>
<kwd lng="es"><![CDATA[pedogénesis]]></kwd>
<kwd lng="es"><![CDATA[geoarqueología]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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