{"id":62508,"date":"2019-07-19T07:00:34","date_gmt":"2019-07-19T10:00:34","guid":{"rendered":"http:\/\/patagoniambiental.com.ar\/info\/?p=62508"},"modified":"2019-07-18T13:32:10","modified_gmt":"2019-07-18T16:32:10","slug":"las-aguas-llegaban-hasta-marcos-paz-reconstruyen-un-mar-prehistorico-que-cubrio-parte-de-buenos-aires-hace-mas-de-70","status":"publish","type":"post","link":"https:\/\/patagoniambiental.com.ar\/info\/las-aguas-llegaban-hasta-marcos-paz-reconstruyen-un-mar-prehistorico-que-cubrio-parte-de-buenos-aires-hace-mas-de-70\/","title":{"rendered":"LAS AGUAS LLEGABAN HASTA MARCOS PAZ Reconstruyen un mar prehist\u00f3rico que cubri\u00f3 parte de Buenos Aires hace m\u00e1s de 70"},"content":{"rendered":"<div class=\"panel-title\">\n<p>Investigadores de la Universidad de La Plata, del Museo de La Plata, del CONICET y de la Universidad de Comahue identificaron rastros de sedimentos marinos, peces y ostras en Marcos Paz, propios de un per\u00edodo geol\u00f3gico en que el mar tuvo una subida muy pronunciada.<\/p>\n<\/div>\n<p><!--more--><\/p>\n<div class=\"panel-media\">\n<ul class=\"nav nav-tabs pull-right\" role=\"tablist\">\n<li class=\"active\"><a role=\"tab\" href=\"http:\/\/www.ctys.com.ar\/index.php?idPage=20&amp;idArticulo=3830#video\" data-toggle=\"tab\">Video<\/a><\/li>\n<li class=\"\"><a role=\"tab\" href=\"http:\/\/www.ctys.com.ar\/index.php?idPage=20&amp;idArticulo=3830#galeria\" data-toggle=\"tab\">Galer\u00eda<\/a><\/li>\n<\/ul>\n<div class=\"clearfix\"><\/div>\n<div class=\"tab-content\">\n<div id=\"video\" class=\"tab-pane active\">\n<div id=\"videonota\" class=\"clearfix\">\n<div id=\"vid3830\" class=\"jwplayer jw-reset jw-state-idle jw-skin-seven jw-stretch-uniform jw-flag-aspect-mode jw-breakpoint-4 jw-flag-user-inactive\" tabindex=\"0\">\n<div class=\"jw-controls jw-reset\">\n<div class=\"jw-nextup-container jw-reset\">\n<div class=\"jw-nextup jw-reset\"><button class=\"jw-nextup-close\" aria-label=\"Next Up Close\"><\/button><strong>Agencia CTyS-UNLaM &#8211;\u00a0<\/strong>La doctora Elisa Beilinson del Centro de Investigaciones Geol\u00f3gicas (CONICET-UNLP) afirm\u00f3 a la Agencia CTyS-UNLaM que \u201ca partir de informaci\u00f3n recopilada desde el a\u00f1o 2010, hemos llegado a reconstruir c\u00f3mo se produjo esa ingresi\u00f3n marina\u201d.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"panel-body\">\n<p>\u201cEncontramos estratos con fauna marina, con fauna propia de estuarios y, a pocos cent\u00edmetros de distancia, fauna continental\u201d, indic\u00f3 Beilinson, autora principal del estudio publicado en la revista cient\u00edfica Quaternary International.<\/p>\n<p>Los cent\u00edmetros de distancia, en las capas geol\u00f3gicas, son dimensiones de tiempo. Cuanto m\u00e1s profundo se excava, m\u00e1s antiguos son los sedimentos. En dicha cantera, llamada Vignona III, el trabajo para retirar tosca ha permitido descubrir f\u00f3siles de entre unos 8 mil y 90 mil a\u00f1os de antig\u00fcedad. En tanto, una parte del terreno se ha establecido como reserva paleontol\u00f3gica.<\/p>\n<p>La ge\u00f3loga precis\u00f3 que se han encontrado \u201cinvertebrados marinos como las ostreas, vertebrados acu\u00e1ticos como corvinas y tortugas, y, muy cerca, una especie de caballo extinta\u201d.<\/p>\n<p>\u201cPor esta mezcla de fauna acu\u00e1tica y continental, junto las caracter\u00edsticas sedimentol\u00f3gicas de los estratos, interpretamos que se trata de niveles depositados durante episodios de tormentas fuertes que impactaban en las zonas costeras del estuario interno del Rio de la Plata que hab\u00eda en ese momento y llegaba hasta la zona de la actual de Marcos Paz\u201d, coment\u00f3 la especialista. Y agreg\u00f3: \u201cEstas grandes tormentas podr\u00edan ser similares a las sudestadas que conocemos hoy en d\u00eda\u201d.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"size-medium wp-image-62510 alignleft\" src=\"https:\/\/patagoniambiental.com.ar\/info\/wp-content\/uploads\/2019\/07\/Sin-t\u00edtulo-6-600x280.jpg\" alt=\"\" width=\"600\" height=\"280\" \/><\/p>\n<p>El paleont\u00f3logo Leopoldo Soibelzon del CONICET y Museo de La Plata (UNLP) coment\u00f3 que \u201cen esta cantera, se han encontrado grandes mam\u00edferos terrestres, algunas grandes aves y tambi\u00e9n anfibios, reptiles y peces\u201d.<\/p>\n<p>En el aspecto geol\u00f3gico, se observa que, hace m\u00e1s de 70 mil a\u00f1os, hubo una subida del mar muy pronunciada, por lo que las aguas ingresaban por la cuenca del R\u00edo Matanza hasta la zona de Marcos Paz. \u201cLo que observamos como evidencia son restos de valvas de ostras y, posteriormente, sedimentos que indican la bajada del mar y la vuelta de ambientes de pastizales\u201d.<\/p>\n<p>Lo que se observa en aquellos sedimentos no es un fondo de mar, sino que hubo un estuario donde el mar se encontraba con el continente. \u201cEs un registro interesante e importante a nivel global, ya que se vincula con este estadio isot\u00f3pico 5E que nivel global marc\u00f3 un ascenso del nivel del mar en todo el mundo\u201d, asever\u00f3 Beilinson.<\/p>\n<p>La investigadora de la UNLP aclar\u00f3 que \u201cpueden haber ciertos debates, porque el aumento del nivel del mar en el hemisferio norte est\u00e1 datado en unos 120 mil a\u00f1os, mientras que los sedimentos de este estuario son m\u00e1s j\u00f3venes de acuerdo a las dataciones realizadas con radiocarbono y luminiscencia opticamente estimulada, pero ocurre que, a diferencia de lo que se suele considerar, la elevaci\u00f3n del nivel del mar no se produce en todas la partes del mundo al mismo tiempo\u201d.<\/p>\n<p>De este estudio, tambi\u00e9n participaron Mar\u00eda Sol Raigemborn del Centro de Investigaciones Geol\u00f3gicas (CONICET-UNLP), Sergio Rodriguez de la Facultad de Ciencias Naturales y MLP, Esteban Soibelzon, Germ\u00e1n Mariano Gasparini y Facundo Iacona del Museo de La Plata-UNLP y CONICET, Lydia Calvo-Marcilese del Laboratorio de Bioestratigraf\u00eda (YPF Tecnolog\u00eda), Gabriela Cusminsky de la Universidad Nacional del Comahue (INIBIOMA-CONICET) y Florencia Mari del Centro de Investigaciones Geol\u00f3gicas (CONICET-UNLP).<\/p>\n<div id=\"infopub\">\n<div id=\"fechapub\">Fecha de Publicaci\u00f3n: 2019-07-18<\/div>\n<div id=\"fuentepub\">Fuente: Agencia CTyS-UNLaM<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Investigadores de la Universidad de La Plata, del Museo de La Plata, del CONICET y de la Universidad de Comahue [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":62509,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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